Corrected entry: Throughout the movie, and including the climatic battle sequence between the Enterprise and General Chiang's Bird of Prey, Scotty is wearing his black "casual" duty uniform. When Kirk and company beam down to Kitimer, Scotty is wearing his red uniform. When they return to the Enterpise, he's back in his black uniform.
Corrected entry: When communicating with the Klingon vessel, Uhura uses a book to search for the correct words and translation. She can't use the universal translator to do the job for her, because the Klingons would recognise that. Why doesn't she use the universal translator as example and then simply repeat it to the Klingons, instead of making a mess of it with the books?
Corrected entry: Towards the end of the film when the Enterprise is under attack by the invisible Klingon ship, Spock asks Dr. McCoy if he'd like to perfom a surgery on a torpedo to enable it to detect the plasma emitted by the Klingons. But McCoy is a medical doctor and can hardly be qualified for this work. Why doesen't Spock just ask Scotty, who is also present and doesn't have anything else to do?
Corrected entry: In begining of the movie, a moon in the Klingon home system explodes, sending out a shockwave that travels across Klingon space, across the neutral zone and into Federation space to hit the USS Excelsior so fast that it wasn't detected before it hit the ship. First of all, the shockwave should be restricted to the speed of sound, it would have taken years to arrive to the Excelcior's location and second, in the movie S.T.: Generations, a shockwave from a collapsing star takes several minutes to hit a space station in the same system.
Corrected entry: Years of dispute with the Klingons, and Federation engineers haven't managed to circumvent the cloaking device - yet a 100% effective torpedo is built on the Enterprise by a doctor, during a battle, using instructions from a radio-operator, in under 10 minutes. Makes you wonder why Starfleet actually has engineers.
Corrected entry: When communicating with the Klingon vessel, Uhura consistently mispronounces the Klingon word for 'over.' The Klingon she's speaking to pronounces it 'reen.' Uhura keeps pronouncing it 'ren.' The mistake is relevant because they're speaking Klingon directly to avoid being recognized as a Starfleet vessel.
Corrected entry: During the scene in which Bill and Admiral Cartwright discuss Operation Retrieve with the Federation President, the person who briefs the president on Operation Retrieve is called Colonel West. But when you look at West's uniform closely, it can be seen that he carries the rank of Admiral. And according to many Star Trek sites, the rank of Colonel doesn't even exist in Starfleet's ranking system.
Corrected entry: In the scene where the Enterprise surrenders and Kirk and McCoy are about to beam to the Kilingon ship, if you watch carefully you can see Spock put his hand on Kirk's shoulder and place the tracking device there, which comes into play later when the Enterprise rescues him from the dilithium asteroid.
Corrected entry: When the court is listening to the playback of Kirk's personal log stating he never could forgive the Klingons for the death of his son, General Chang is standing behind Kirk and several meters away. He asks Kirk if those were his words. Kirk says, "Those words were spoken by me." When Kirk's defense counsel objects, we see a wide angle shot of the room behind Kirk, and Chang is no longer there.
Corrected entry: When the Chancellor's ship is fired upon by the cloaked Bird of Prey, the clock above the Enterprise bridge viewer shows the time as 01:18. When the assassins have beamed back to the Enterprise and the Klingon ship begins to list, the time is 01:38. Right after this, when Chang tell Kirk that he will "Blow you out of the stars", the clock above the bridge viewer shows a time of 01:29. This is on the DVD version.
Corrected entry: Spock interrogates Lt. Valeris with the mind meld, he finishes and takes his hands off her. She is in some kind of emotional trauma, her mouth is wide open gasping like a fish and she's whimpering. Spock turns around and the camera angle changes to face him. In the background Valeris is standing there looking very cool and calm. I'd imagine it would be rather difficult to collect herself in less than a second.
Corrected entry: When searching the crew quarters, a magnetic boot is found in Dax's locker. The locker door either shows damage in the paint when the scene had to be re-shot or it's the device to hang a non-magnetic boot onto a non-metal door. This is evident both when Valeris hangs the boot on the door and when Chekov removes it later on. (01:10:25)
Corrected entry: Right before Kirk beams aboard the Klingon vessel, Spock pats him on the back. He turns around and you can see the large black tracking device that Spock has stuck to his back. Throughout the film they use this device to track Kirk. Kirk was arrested, sentenced, and sent to a prison. Kirk wears his uniform throughout this entire process and the tracking device is blatantly obvious on him. Why didn't any Of his many Klingon guards frisk him and remove it?
Corrected entry: The character of Colonal West is an uncredited character. This character is portrayed by Rene Auberjunois, the same actor who plays Odo on DS9. Any actors appearing in a ST movie out of character are uncredited. (Neelix as the Holodeck Mate'd in ST: First Contact, and Tuvok on the bridge of the Enterprise B in Generations) However, this came out before DS9, so he must have already been signed on to the series.
Corrected entry: Captian Sulu's coffee mug clearly shows "NCC-2000 U.S.S. Excelsior" on the side of it. A few scenes later, when the mug is vibrating and bouncing around on the table, the writing is gone.
Corrected entry: At the beginning of the movie, the Excelsior is hit by a shockwave coming from the Klingon moon Praxis (the Excelsior would be in Federation space, dozens of light years from the moon). The force of the shockwave is such that the ship is physically thrown about, as are the crew. A blast that is so strong at such an extreme range would surely destroy not only the moon but also the Klingon homeworld and most other things in Klingon territory. This, however, isn't the case; Praxis is later shown to be only half destroyed.