Star Trek II: The Wrath of Khan
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Continuity mistake: When Khan contacts the Enterprise after Reliant's opening attack, Kirk has his uniform jacket unbuttoned to about mid-chest level (a little above his stomach). When Khan demands all information on Project Genesis be turned over, and Kirk responds with 'Genesis? What's that?' his jacket is now unbuttoned all the way down to his belt.

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[Spock has just been severely irradiated while saving the ship, and is dying.]
Spock: Do not grieve, Admiral - it is logical: the needs of the many outweigh
Kirk: The needs of the few...
Spock: Or the one.

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Trivia: Early script drafts featured Khan gaining psychic powers with the ability to create illusions in the minds of others. One draft even replaced Khan entirely with an original villain who better suited such fantastical mental powers. By the time Nicholas Meyer wrote the shooting script, Khan was reinstated as the villain and the psychic angle was dropped.

TonyPH

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Question: When the Enterprise recovers Chekov and Captain Terrell, they just accept Chekov's and Terrell's false explanation, even though McCoy is standing right there with a medical tricorder. Why didn't McCoy's medical tricorder pick up the Ceti eels lodged in the brains of Chekov and Captain Terrell?

Charles Austin Miller

Answer: It's unknown. The tricorder may not have been programmed at the moment to detect any parasites.

raywest

Answer: The eels bond with the host brain and are virtually undetectable until the host dies or they are found for some reason.

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