Other mistake: In the original theatrical trailer, Stephen King's name is misspelled as "Steven."
Suggested correction: Does a theatrical trailer error count as a movie mistake?
Other mistake: After speaking with Dave Bowman on her TV, Betty lays her head on the table and we see an obvious cut & paste as her form shifts slightly. (01:09:35)
Other mistake: After the early truck chase, Axel arrives at the police station. He walks through a glass door that reads 'Investigaton Operations Division' which is missing the last 'i' in the first word, exactly as I've typed it here. (00:08:10)
Other mistake: As the Terminator is approaching Sarah in the Tech Noir nightclub, several other patrons can be seen behind her sitting in booths. These same people are in front of Kyle (he pushes them out of the way to get to Sarah before the Terminator does), yet he's on the other side of the club by the bar. (00:35:10)
Other mistake: During the final fight, the Black Ninja (which confusingly enough is the one wearing green, and the ninja in black is the good guy) in some shots wears pale white cadaver makeup around the eyes, and in other does not. His fingers are also constantly of a healthy color.
Other mistake: When Jake picks up Gloria's driver's license in the tunnel after it has spilled out of her pocket book, it can be seen that the area on the license where all of her personal information (e.g., Date of Birth, Height, Eye Color) should be listed under her name and address is blank. (00:50:20)
Other mistake: When Savic is sleeping, a burst of energy from planet pushes the tree she is leaning on upward. There is a Klingon above that almost gets hit with it. Savic should have seen him and started moving with Spock. This might have been a scene meant to be used later at the climax. (00:57:00)
Other mistake: Vicky is murdered and her corpse pops out of the closet. She slowly opens her eyes despite being dead.