Star Trek IV: The Voyage Home

Corrected entry: When Spock analyzes the call of the probe and compares it in a phylum search, he's presumably interfacing with the Federation memory bank as mentioned in Sulu's pre-launch status. However, the alien probe was disrupting all power and communications in the vicinity of Earth. It's extremely unlikely the ship could've interfaced with the Federation memory bank at the time of that search. (00:24:55)

Correction: There's no reason to assume the Federation memory bank is centralized on Earth, or not networked throughout several member worlds. The original series episode "The Lights of Zetar," for example, showed a Federation central library facility on a planet called Memory Alpha (which is where the Star Trek wiki gets its name).


Corrected entry: In the second last scene when the bird of prey crash lands under the Golden Gate bridge, Kirk orders Spock to blow the hatch so the crew can escape. The camera is pointing up inside the ship to the outside of the ship and you can see the top of an industrial shed (01:40:10)

Correction: Watching this scene carefully, there is no evidence of an industrial shed, or anything else. You see the top of the ship, and the hatch closely behind Spock. When he blows the hatch, you just see white, but no significant details to make out what could be outside.

Corrected entry: When the Marines are chasing Chekov aboard the aircraft carrier, the sign "Escape Route" and an arrow can be seen stenciled in paint on the wall.


Correction: This is just a marking so sailors have visual clues on the best evacuation route in an emergency.


Corrected entry: Given the distance the probe must have traveled before it reached the Neutral Zone it would had to have encountered starships long before encountering Saratoga, so why didn't Starfleet know about the probe before Saratoga was neutralized?

Correction: Several reasons. The Klingons are enemies with Starfleet. About ready to go to war thanks to Kirk, so they're not likely to report anything to Starfleet about a dangerous probe coming their way. Also, you never know the path it traveled & what/if any federation ships came into contact with it. And, the ones that did would have lost power & not been able to communicate to Starfleet. Starfleet only regained power after the probe was satisfied that they were able to communicate with the whales.


Corrected entry: The computer screens that Spock is testing himself on are already responding with "correct" before he answers the questions.

Correction: There is no part during the questioning in which the computer answers correct before he answers the question. They do a segue where they show the computer asking questions & saying correct quickly. This is to show that Spock is being asked a lot of questions & getting them all correct, until they get to the final question "how do you feel?" It's shot that way intentionally to fast forward through all the questions he's asked & show how much he knows.


Corrected entry: Kirk conveniently has the broken pair of reading glasses with him that he sells to the antiques dealer in 1986. The glasses were damaged at the end of "Wrath of Khan" which means he would have no further use for them, but for some reason he would have had to have them on him during the events of "Search For Spock" for them to be stranded with him on Vulcan, just as he and the crew were at the beginning of the movie.

Correction: In The Wrath of Khan, it was established that Kirk carried the glasses with him, only putting them on when needed. Even though he never used them in Search for Spock doesn't mean he didn't have them with him.

Corrected entry: When the 'Bounty' materializes above the whaling ship, the close-up of the captain and navigator frantically turning the ship around reveal that only the captain has his hands on the wheel; the navigator is flapping his hands in the air rather than helping turn the wheel of the whaling ship.

Correction: The navigator is freaking out, seeing a giant space ship materialize in front of him. He's obviously not thinking straight, thinking he's turning the wheel. If something like that happened to an ordinary person, they probably wouldn't know what they were doing either.


Corrected entry: When the Bounty takes off from Vulcan and flies away, no shadow is visible despite the fact that it is a very sunny day. (00:16:20)

Correction: This is incorrect. Vulcan has multiple suns, so there would be minimal shadows cast.

Corrected entry: When Spock and Kirk theories over who the probes signal might be meant for, Spock say "The President did say it was directed at earths oceans", the president never said that, he only said it was vaporizing the oceans, he never mention it being directed anywhere.

Correction: If it's vaporising the oceans, it's hardly an unreasonable assumption that it's aimed at them. If it was having negative effects across the world, affecting everywhere, the President would hardly have singled out the oceans to comment on.

Tailkinker Premium member

Corrected entry: In the scene where the commander of the navy ship is on the phone, first he is told that nobody knows why they are having a power drain. Then suddenly he makes a call and says that there is an intruder. There is no way he or anyone else could have suddenly known there was an intruder, because nobody had physically seen or detected Chekov and Uhura yet. And there is no "modern" technology that could drain power from the reactor so there was no reason to equate the power drain to an intruder alert.


Correction: When he is informed about the power drain the phone rings. He speaks with someone that calls him Chief, apparently one with higher rank, and tells him that they are tracking the drain too and asks about an opinion of what it is. Then the scene cuts to Uhura and Chekov who try to communicate with Scotty, and after the scene goes back to the Navy and Commander Rogerson who says "Confirmed, roger that" and he makes the phone call about the intruders. Apparently on the phone they pick the transmission of Uhura and Chekov or identify exactly where the power drain was and informed the commander on duty.

Anastasios Anastasatos

Corrected entry: In the scene where Scotty beams up the whales and water to the ship, you can see the water completely fills the compartment from top to bottom so the whales would have had no air layer to breathe.


Correction: We don't actually know the internal structure of the tank, nor can we see it in the movie. The top of the glass is not automatically the top of the tank/water surface; in other words, the height of the tank may be higher than what we can see from the outside. The water surface may go higher than the glass we are able to see, and therefore, have air up there.

Corrected entry: In the scenes where Kirk's communicator goes off (like during dinner with the scientist lady) to simply inform him that Chekhov is about to beam to the ship, this completely goes against his first orders given before they landed that communicators should only be used in case of emergencies.


Correction: Uhura and Chekov were about to infiltrate a United States vessel in order to steal nuclear particles. Sounds like an emergency to me.

JC Fernandez

Corrected entry: In the scene where they spray paint the ship, you can see the ship is suspended on landing gear. then later when it lands in the park cloaked, the special effect shows the garbage can being compressed under the ship, and the outline of the entire ship indenting into the ground, as if the entire ship is making contact with the ground,but really only the small area of the landing gear should be compressing the ground and only at certain points.


Correction: At no time do they ever show an entire indentation of the ship in the ground. Even when Scotty is looking down through the invisible ship while loading the plexiglass the only indentations in the ground are from the landing gear.

BocaDavie Premium member

And it's also plausible they hovered the ship during certain times in 'cloaked' mode so people did not collide with it. Would take a minimal amount of energy just to hover surely.

Corrected entry: In the scene where the helicopter is flying, the plexiglass is much smaller than the size they had previously stated (60 by 10 feet).


Correction: The previous statement they made about the size of the plexiglass was an estimate. They obviously had to change the sizes - either because of the helicopter's lifting capacity or because of the size of the openings at the top of the warbird.

BocaDavie Premium member

Corrected entry: Dr. McCoy advises Scotty about giving the manufacturer the formula for the transparent aluminum for fear that it would alter history. Yet he himself gives the elderly woman in the hospital the pill that grows her a new kidney, hence future medical technology in the hands of 20th century physicians, something doctors and others would definitely be studying after the woman's miraculous recovery.


Correction: Why would it alter history? Unexplained 'miracles' happen in medicine often enough. And its not out of character for Bones to put his Hippocratic Oath above the Prime Directive.

Grumpy Scot

Corrected entry: It is established at the start of the movie that the Klingon Bird of Prey is the same one that they flew to Vulcan in Star Trek III: Search for Spock. The bridge of the ship however is totally and utterly different to the one shown in the previous movie. There can be no claim to suggest they remodelled it in their time on Vulcan, because everyone still uses the controls with a degree of caution, which they wouldn't do if they modified it to suit their needs.


Correction: There most certainly can be made a claim that they remodeled it on Vulcan. What difference does it make if they, "use the controls with a great deal of caution?" People use brand new things and things they are already familiar with a great deal of caution. And this measurement is highly subjective at best. The crew is likely a bit apprehensive because the "guts" of the ship, for lack of a better term, are still Klingon. Scotty even speaks negatively of the dilithium crystals in the ship at point.

Corrected entry: The humpback whales are about to be returned to Alaska for release back into the wild. Dr. Gillian Taylor tells Kirk and Spock that Gracie is "very pregnant." In that event, the whales should be released in Hawaii instead of Alaska. Humpbacks give birth in warm, south Pacific waters during the winter and later migrate north for summer. (01:04:30 - 01:21:20)

Correction: A specific date or time of year is never mentioned, however the weather in San Francisco, as well as the clothing of its denizens suggests that it's not winter and may very well be the height of summer. If so, dropping the whales off in the Alaskan waters where they are more likely to encounter a pod to join is completely justified. Yes, whales typically birth in the warm Hawaiian waters over winter, but George and Gracie were in captivity. The situation could very well have altered their natural cycle.

JC Fernandez

Corrected entry: Immediately after the whales' transponders are located in the Bering Sea, Gillian can be seen mouthing, "How can you do that?" without sound, then she is immediately seen and heard giving the same line from another camera angle.

Correction: She first wondered to herself, mouthing the words with little or no sound, then immediately spoke up to actually ask Kirk the question.


Corrected entry: When the crew starts to evacuate the Bird of Prey from the ship's hatch, the sound stage wall is easily visible.

Correction: That's the wall of the escape hatchway, not the sound stage wall.


Corrected entry: In the chase scene where Checkov is being rescued from the hospital, there is a shot where the crew bursts through some doors and knock over a man on crutches wearing a cast. As he falls, Bones grabs him and the camera pans off. Once the camera pans, you can hear Bones say to him, "Great shot!" This was on the video version of the movie. I haven't seen the DVD.

Correction: As the shot opens, when McCoy holds the door open for Kirk (who pushes Chekov's gurney through the doorway), McCoy turns around just in time to see the man with a leg cast (being assisted by a candy-striper) lose his balance and fall backwards directly onto the bench beside the wall, right next to another man. McCoy is pleased that the man landed perfectly on the bench, when he concernedly rushes to him and says, "Great catch" as he leans down.

Super Grover Premium member

Other mistake: After they take off from California, Kirk gives a heading to Alaska. He then tells Sulu "full impulse power", and Sulu says "aye, ETA 12 minutes." Full impulse is 1/4 the speed of light. No way they would use speeds like that to go a few thousand miles.

More mistakes in Star Trek IV: The Voyage Home

Kirk: Mr. Spock, have you accounted for the variable mass of whales and water in your time re-entry program?
Spock: Mr. Scott cannot give me exact figures, Admiral, so... I will make a guess.
Kirk: A guess? You, Spock? That's extraordinary.
Spock: [to Dr. McCoy] I don't think he understands.
McCoy: No, Spock. He means that he feels safer about your guesses than most other people's facts.
Spock: Then you're saying... It is a compliment?
McCoy: It is.
Spock: Ah. Then, I will try to make the best guess I can.
McCoy: Please do.

More quotes from Star Trek IV: The Voyage Home
Star Trek IV: The Voyage Home mistake picture

Trivia: Kirk Thatcher, an associate producer of the film, played the punk on the bus, and also wrote the song ("I Hate You") the punk is listening to on his boombox. (00:43:45)

wizard_of_gore Premium member
More trivia for Star Trek IV: The Voyage Home

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