Continuity mistake: When Spock is kneeling in his quarters, talking with Kirk, a shot facing Spock's front shows that the bottom of the lighted mirror on the wall is behind his head. In the next side shot, it's not there as he is now much further from the wall and the mirror is out of the shot at right. The angle of the second shot does not excuse the mistake- the mirror should still be visible at the new angle. (Director's Cut DVD). (00:39:30)
Continuity mistake: In the training simulator at the beginning of the film, after Sulu and McCoy have both fallen, McCoy has his head resting on Sulu's hip at first. Then, in the next shot, his head is resting closer to Sulu's knee. (00:05:50)
Answer: Lt. Marla McGivers was the crew member.