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Quotes

[Kirk is pawning his reading glasses.]

Spock: Excuse me, Admiral, but weren't those a birthday gift from Doctor McCoy?

Kirk: And they will be again. That's the beauty of it.

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Mistakes

When we first see the Klingon bird of prey on Vulcan (just before we see closeups of the "Bounty" written on the side) it is clear that the ship is far too small to contain a pair of adult humpback whales plus 18000 cubic feet of water in its hold. Later, when the ship is hovering above the sea after foiling the whaling ship's attack it seems considerably larger. See more...

Trivia

The scene in which Chekov and Uhura beam onto the Enterprise aircraft carrier was originally slightly different. It was scripted that they would sneak onto the ship undetected, but the American Navy believed that it would be impossible for two intruders to get past a military security force. So it was re-written that the transporter had enough energy to beam the pair onto the carrier, but not to get them back off. See more...

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Star Trek IV: The Voyage Home (1986) - 32 corrections

Directed by Leonard Nimoy, starring Catherine Hicks, DeForest Kelley, George Takei, James Doohan, Leonard Nimoy, Nichelle Nichols, Walter Koenig, William Shatner (add more)

Genres: Adventure, Comedy, Mystery, Sci-fi

Comments made in brackets are corrections from other visitors. To submit your own corrections for mistakes, just click "edit" under an entry, then choose "correct entry". You can also submit corrections for corrections, if you think a mistake has been unfairly removed.

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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. [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.]
Edit
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. [Uhura and Chekov were about to infiltrate a United States vessel in order to steal nuclear particles. Sounds like an emergency to me.]
Edit Corrected by JC Fernandez
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. [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.]
Edit Corrected by BocaDavie
In the scene where the helicopter is flying, the plexiglass is much smaller than the size they had previously stated (60 by 10 feet). [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.]
Edit Corrected by BocaDavie
When Kirk and his crew stand before the Federation President, they are there to answer for the charges against them in the previous film. Other than trying to get a ship to Genesis, McCoy should not be included in the hearing since he had no way of knowing that Kirk would break him out of jail, steal the Enterprise, then escape to Genesis. [Just like you said, they broke him out of jail. At that point he was a fugitive. And he went along with the plan, making him an accomplice.]
Edit Corrected by Greenman37
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. [This is just a marking so sailors have visual clues on the best evacuation route in an emergency.]
Edit Corrected by MAdMaN
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. [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.]
Edit Corrected by Grumpy Scot
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. [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.]
Edit
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. [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.]
Edit Corrected by JC Fernandez Time
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. [She first wondered to herself, mouthing the words with little or no sound, then immediately spoke up to actually ask Kirk the question.]
Edit Corrected by John W Rosa
When the crew starts to evacuate the Bird of Prey from the ship's hatch, the sound stage wall is easily visible. [That's the wall of the escape hatchway, not the sound stage wall.]
Edit Corrected by John W Rosa
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. [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. ]
Edit Corrected by lmao
In a scene with Norwegian whalehunters, the sailors speak Finnish not Norwegian. They are also using somewhat obscene words, maybe all sailors do. [There is a minority people in Northern Norway called the Kvens. They originally came from Finland, and the language they speak, the Kven language, is still quite close to Finnish even though it has adapted at least some lexical aspects from Norwegian. Being a Finn, I understand what the whalers say, but can recognize some words that are more Norwegian than Finnish.]
Edit
When Spock announces "Gracie is pregnant," Gillian slams on the brakes and stops her truck. Look at the convex mirror on the passenger side next to Kirk. Despite the fact that there are joggers and other things moving in the background, there is no movement in the mirror; at that angle the viewer should have seen lots of movement in the convex mirror. [In the brief moment the convex mirror is shown as the car stops, its reflecting side is not visible. The rest of the scene is an interior shot, the mirror is not visible, and there is plenty of action in the background.]
Edit Time
Starfleet has serious regulations on bringing future technology to inappropriate time periods (which is why the Bird of Prey remained cloaked during it's time in 1986). Chekov being fully aware and considerate of these regulations, considering he has been in Starfleet for about 20 years should have never tossed the Klingon phaser (23rd Century technology) at the navy officer (20th Century person) with full knowledge that he'll never be able to retrieve it. He is too smart for it to have been panic. [Maybe a bad error in judgment, but a character mistake, not a movie mistake.]
Edit Corrected by wizard_of_gore
At the Start of the Final scene of the film, when the crew are approaching the new Enterprise-A in the inspection pod, Kirk is correctly wearing a Captain's Rank Pin on his tunic, however, his tunic still has the gold braiding of an Admiral. [Kirk probabaly hasn't had enough time to fully update his uniform.]
Edit Time
As they descend into the park, Uhuru gives a bearing and range of 283 degrees, 15.2 kilometers to the whales, which are supposedly in a marine park in Sausalito. 283 degrees would put you in the Pacific Ocean, because Sausalito bears around 350 from the park. [Bearing is given depending on which direction you are facing, it is not a set measure. If you are facing North, then West is bearing 090, but if you are facing East, it is bearing 180.]
Edit
In the operating room, just after Kirk welds the lock shut, Bones is leaning over Checkov, he reaches out his hand and we assume Dr. Gillian hands him the piece of equipment that he puts on Chekov's forehead to heal him. How did she know what equipment to give him as it was from hundreds of years into the future and Bones doesn't actually ask for it? [Bones says to Dr. Gillian "We're going to have to look like physicians." He could have explained the device to her while she was telling him how to look like a 20th century physician.]
Edit
In a scene early in the movie where Spock is being tested by 3 computers the computer output is being displayed on clear screens that look like teleprompters. One of the camera angles is looking up at Spock from behind the screen. To the viewer the words in the question are backwards (forwards to Spock), but when the word "Correct" is displayed it is forward to the viewer (backwards to Spock). [There are 2 screens for each computer, one facing Spock, the other facing away from him. Everything that appears on Spock's screen appears exactly the same direction on the other screen, and both the questions and the word "correct" appear forwards.]
Edit
When Kirk, McCoy and Dr Taylor escape from the hospital with Chekov, they are "beamed out" of the elevator and "beam" back in at the park next to the Bounty. My understanding is that the transporters can "beam" people from the transporter itself to another place, or from another place back to the transporter, but not from another place to yet another place. I realise that this is required in the movie, because when they arrive back at the Bounty, Kirk tries to tell Dr Taylor she can't come with them, which would have been awkward if they were on board at the time, but it is still a small mistake. [Transporters are quite capable of doing what's depicted in the film - it's generally referred to as a site-to-site transport. It's not something that happens terribly often in the films and series, for the simple reason that it's not often required and it takes up a lot more power than a simple transport to or from the transporter pad itself. But they've always been capable of doing it.]
Edit Corrected by Tailkinker

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