Star Trek VI: The Undiscovered Country (1991)

Continuity mistake: When Captain Kirk and the shape shifter are fighting on the planet (the shape shifter looks exactly like Kirk). They are rolling through the snow about to roll over Bones. In one shot, it looks like they will roll over his feet first, and then the rest of his body. In the next shot, it is a little closer and they roll over Bones' right arm first and not his feet first.

Captain Spock: If I were human I believe my response would be "go to hell." If I were human.
Commander Pavel Andreievich Chekov: Course heading, Captain?
Captain James T. Kirk: Second star to the right and straight on till morning.

Trivia: The Klingon who defends Kirk and McCoy at the trial is Michael Dorn, the actor who plays Worf in The Next Generation. The Klingon makeup is also identical, even though it is supposed to be a different character. (The makeup is actually more subdued than the makeup for TNG [flatter] but it looks similar because he is actually playing one of Lieutenant Worf's ancestors.)