While in Kirk's body, Lester makes a Captain's Log explaining her plan.
This is one of the few episodes of the series where Nichelle Nichols (Lt. Uhura) does not appear at all. Barbara Baldavin, listed as a guest star, appears as the ship's Communications Officer.
At the climax of the episode, when Kirk-as-Lester is fighting with the Doctor and Lester-as-Kirk is screaming, "Kill him! Kill him!", Scotty, Bones and Spock just casually stroll out of the cell to watch the action, instead of rushing into the struggle. Note also the lack of any security guards on the cell of mutineers.
A slightly odd moment. When Spock rescues Kirk-as-Lester from the cell and knocks out the guard, notice he takes Janice/Kirk's hand to lead her away, even though he knows it's really the captain. We've never seen Kirk and Spock holding hands before, and it seems unlikely Spock would feel more emotional/compassionate just because Kirk is now a woman.
Why doesn't Kirk-as-Lester just slip out of the loose restraining strap that is holding him down in sickbay? Why does he waste time cutting himself out?
It seems that when the hearing is taking place, Spock might be able to offer some more proof that the captain is not the captain by asking him to recall specific memories that only Kirk would know. He could also ask Kirk-as-Lester to recall specific stories and memories about the Enterprise. Instead, the only proof Spock offers is his mind meld. Similarly, Kirk-as-Lester doesn't attempt to establish his identity by revealing information only he and Spock or McCoy could know. Instead he talks only about things in the "public record".
How could Kirk order an execution? In the episode "Mirror, Mirror", Spock said to the Kirk from the alternate reality that his authority on the ship is extremely limited when Kirk said that he would execute Spock. Besides, Sulu and Chekov claim that executions are illegal. Don't the security guards care about Starfleet regulations? Why don't they turn on Kirk when he starts to demand executions?
Kirk in Lester's body strolls off away from Spock toward a solid wall when he calls for a vote. He's supposed to be stepping outside - according to the book Star Trek Lives the director screwed it up despite Shatner trying to explain to him there wasn't a door there.
When Lester-as-Kirk sits in the captain's chair, Chekov vanishes/reappears in different shots of the bridge.
When they first arrive, McCoy examines the unconscious supposedly stricken Lester - she's faking but he doesn't notice a thing despite examining her with his medical wand.
Chekov says only General Order 4 carries a death penalty - he's presumably referring to the ban on travel to Talos (from "The Menagerie"), but that was General Order 7.
Spock claims complete entity transfer has never been done anywhere in the galaxy - they did it in "Return to Tomorrow" with Sargon and the others.
McCoy administers a psychological test to Lester-as-Kirk that reveals their basic emotional structure - in court he testifies it matches what Kirk had when he took command of the Enterprise. Lester, who is portrayed as nutty as a fruitcake, would hardly have the same emotional state as Kirk (at least, you'd hope she would not!).
How is Lester-as-Kirk going to get Kirk's safe open? She doesn't have his memories of the combination or anything and it uses a number sequence to open.
Lt. Galloway was the character killed by Captain Tracey in "The Omega Glory" and yet here he is! Maybe he had a twin brother.
Scotty: Suppose you voted with me in favor of Spock. That's two to one and Spock is free. What do you think the Captain will do?
McCoy: I don't know.
Scotty: You know, all right. The vote will stick in his craw. He'll never accept it.
McCoy: We don't know that.
Scotty: I tell you, he won't. Then, Doctor, that's the time we move against him. We'll have to take over the ship.
McCoy: We're talking about a mutiny, Scotty.
Scotty: Aye. Are you ready for the vote?
McCoy: I'm ready for the vote.
Scotty: It may not be scientific, but if Mr. Spock thinks it happens, then it must be logical.
Lester: (as Kirk) It is mutiny! Deliberate, vindictive, insane at its base!
Kirk: Her life could have been as rich as any woman's. If only...if only...
Scotty: I've seen the captain feverish, sick, drunk, delirious, terrified, overjoyed, boiling mad. But up to now, I have never seen him red-faced with hysteria.
Lester: We could've roamed among the stars.
Kirk: We'd have killed each other.
Just prior to the shooting of this final episode, William Shatner had contracted the flu. Since the production had to continue as scheduled, a cot was brought onto the set for Shatner to lie on in between his scenes.
With the obvious exception of William Shatner, Sandra Smith (Dr. Janice Lester) was the only other actor to play Captain James T. Kirk on any Star Trek series or movie until the 2009 movie where he was played by Chris Pine.
Leonard Nimoy is the only actor to appear in every episode of the series, including "The Cage", the original pilot episode.
This episode was originally scheduled to air on March 28, 1969 but was postponed to June 3 due to the death of the 34th President of the United States, Dwight D. Eisenhower, on March 28.
Leonard Nimoy (Spock) and Majel Barrett are the only actors to appear in both the first and last episodes of the series. The latter portrayed Captain Pike's Number One in the original pilot episode "The Cage" and Nurse Chapel throughout the rest of the series.
For the first and only time in the series, Nurse Chapel is a brunette.
As well as being the last episode of the series originally broadcast, it was also the final one production order-wise (the order of episodes from production to broadcast) was often quite shuffled).
After a three-month hiatus, the show received a new slot (Tuesdays @ 7:30 p.m. EDT) with this final first-run segment.