Revealing mistake: When the Enterprise is leaving space dock, look at the right (starboard) side of the ship. You can see the shape of the mounting arm the model was mounted on, even though it was blacked out to look like space, and it also blocked out the bottom of the dock. The footage was reused from Star Trek: The Motion Picture.
Star Trek II: The Wrath of Khan (1982)
Plot summary
Directed by: Nicholas Meyer
Starring: William Shatner, Kirstie Alley, George Takei, Leonard Nimoy, Walter Koenig, DeForest Kelley, James Doohan, Nichelle Nichols, Ricardo Montalban
Khan Noonan Singh, exiled to Ceti Alpha VI in the original Star Trek TV series, seizes a starship and seeks revenge on Kirk, in a manner reminiscent of Captain Ahab from "Moby Dick".
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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.
Question: After the Reliant ambushes the Enterprise, Kirk tricks Khan and hammers the Reliant into retreat. As Kirk turns to assess damage to the Enterprise, Scotty inexplicably appears on the bridge, carrying the charred body of Midshipman Peter Preston. Why on earth would Scotty bring the dying Preston to the bridge, rather than to SickBay with all the other injured? He had to deliberately bypass SickBay just to make an unnecessary appearance on the bridge.
Answer: I believe Preston was already dead at that point. An earlier scene was edited out of the film that explained Preston was Scotty's nephew (his sister's son), and which may account for Scotty's rather odd reaction of first bringing him to the bridge.
Yet Preston is shown alive (still dying) in the SickBay moments later. Preston shares last words with Captain Kirk before he actually dies. So, this is a case of bad editing?
What was edited out of the film was an earlier explanation that Preston was Scotty's nephew-this was way before the Enterprise was attacked.
These scenes, which include several of Preston's lines which were cut, were restored in the 2002 Director's Edition. Curiously, when the film is aired on TV they still run the original video cut which has the scenes removed. The editing is really sloppy with the scenes cut out and the scenes establishing that Preston is Scotty's nephew add another emotional layer to the film. It makes Scotty's actions make so much more sense, he's overcome with grief over his nephew and anger at Khan. With the scenes cut what Scotty does makes very little sense.
In the novelization, I believe it is explained that the ship is badly damaged enough that Scotty reached the bridge while attempting to get to sickbay because the computer glitched.
Answer: At the time of the attack, most of Scotty's crew were attempting to flee a coolant leak caused by the damage. Cadet Preston (Scotty's nephew) remained at his post in the confusion, and was the reason the Enterprise was able to maintain minimal power with the energizers knocked out. Although he was wounded from the assault while rescuing another crew member, the coolant leak is what led to his ultimate demise, as the coolant was highly toxic. When Scotty brought him to the Bridge, he was himself quite disorientated from the events and was also devastated by his nephew's condition. Agreed it makes little to no sense, but Scotty didn't know what he was doing. His nephew was going to die, regardless of where he took him to. Going to sickbay would not have prevented it at this point. It seems like it was used as a mood breaker for the scene, crews celebrating their escape from death only to be confronted by it again in another form.