Other mistake: When Sulu tells Kirk he is coming to help, he states the Excelsior is currently in the Alpha Quadrant. The problem is the the Alpha Quadrant in the Star Trek universe is one quarter of the total Milky Way Galaxy. While technically correct, Sulu giving his position as in the Alpha Quadrant is useless to Kirk in terms of knowing when to expect help. It doesn't matter where Khitomer is in the galaxy. Sulu saying he is in the Alpha Quadrant gives Kirk absolutely no idea of when he will arrive. He could be anywhere from 5 minutes away to 5 weeks away or even further. Remember, it was originally projected to take Voyager 70 years to go from the Delta Quadrant back to the Federation in the Alpha Quadrant.Guy
Continuity mistake: When Kirk and Sulu are talking about the details of the peace conference, you can see Sulu on the small display behind Kirk. When Kirk asks when the conference starts, you can see on the small display that someone leans in to tell Sulu the information. When the camera cuts to Sulu the person is no longer leaning in but is standing behind Sulu. (01:28:20)smd9
Continuity mistake: It's slight, but noticeable. The nails used to keep Chang's eye patch in place change slightly over the course of the film. For example, when they're beamed aboard the Enterprise, the nail closest to Chang's eye is at the top of the patch. But, during the climactic battle, it's down, closer to his nose.
Other mistake: It was shown that whatever form Martia was in, whether it be the attractive semi-human form, the Sasquatch form, or the little girl form, her voice always remained the same. Why didn't her voice remain when she morphed into Kirk?
Continuity mistake: In the opening scene when Sulu is on the bridge and the energy wave begins vibrating the Excelsior, when Sulu's tea cup begins vibrating across the table, it's first seen closer to Sulu. The next close shot shows it vibrating right to the edge of the table. Yet in the next wide shot, it's back where it was near Sulu again. Then in the following close, it's back at the edge, this time sliding off to the floor. (00:04:00)
Continuity mistake: When the Excelsior enters the battle in orbit of Khitomer, General Chang's Bird Of Prey is on top of her. However, when he orders to fire upon her, she is hit from below.
Character mistake: At the trial, the witness said that "With the first shot, we lost our gravitational field. I found myself weightless, and unable to function." However, the first shot caused the ship to start listing to port. It was the second shot that caused the gravitational failure.Movie Nut