Character mistake: Near the end of the film, Kirk mentions that he had a brother once, to which Spock appears surprised. Kirk then responds that he was lucky to get him back, referring to Spock's death and rebirth in the second and third films. One problem - Kirk DID have a brother, who died at the end of the original series' first season. Spock doesn't seem like the kind of person to forget about such things, especially as he was nearly killed by the same parasites. Spock's memory may still have been incomplete, although you'd think he'd know such a major detail about his best friend. However, McCoy should definitely remember Kirk's brother, especially seeing as he was the one who pronounced him dead.
Continuity mistake: When Spock, wearing rocket boots, is in the turboshaft carrying Kirk and McCoy on either arm, he fires the booster rockets, thus propelling the three of them up the turboshaft. If you watch carefully, the deck numbers in the background as they rise upwards go as follows: 35, 52, 64, back to 52, 77, 78, and then 78 again! Not content with one goof, Kirk and McCoy can quite clearly be seen with their feet dangling in mid air, not on Spock's boots. They aren't exactly clinging to him either, more like leaning against him. Surely Kirk and McCoy would be unable to hold onto him!
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