Despite the fact Flint doesn't want Rayna to know her true origins, he doesn't shut the door behind him when he confronts Kirk and the others in his laboratory.
The remastered syndication cuts remove the entire ending scene where McCoy explains to Spock that Flint will die, leaving a rather large unresolved plothole.
When they find the Raynas, McCoy says "Physically human, but not human." However, there's no indication that he scans any of them, or has even scanned the current Rayna. So there seems to be no way for him to know what they are physically. Even if he did scan the newest Rayna, he'd have no way to know if she's a real human and the others are android duplicates.
Despite the fact they are presumably infected with Rigelian fever the same as the rest of the crew, Kirk and McCoy (and presumably Spock if it affects Vulcans the same way) display no ill effects at any time during the episode. Also while it's not specifically stated that Rigelian fever is contagious, no one seems concerned about giving it to Flint and Rayna, despite Kirk having rather... close contact with the latter.
Spock is standing at the piano playing the Brahms waltz. Flint invites him to play, the camera cuts away for barely two seconds, and when it cuts back Spock is comfortably seated and already several bars into the waltz.
When Kirk and Rayna are playing billiards, the position of the balls changes between continuous shots.
Kirk begs Rayna to come with him. What exactly does he plan to do with her is she comes? Is Kirk just going to have a girlfriend riding around on the Enterprise with him at all times? Starfleet might not like that.
Flint says to Kirk, "Your crew is not dead, but suspended". Kirk then replies with "Worse than dead!". Um, how is being suspended worse than being dead? A suspended person can be unsuspended at some point, but a dead person is, well, dead.
Ater the first batch of ryetalyn is contaminated with irillium, McCoy goes with Flint to gather more. Kirk then tells Spock to wait in the main room while he goes to lab to see if there is a way to reverse the irrilium's effect and save the existing ryetalyn. If there's a way to save the existing ryetalyn, why isn't McCoy in the lab trying to do this? When Kirk goes to the lab he does absolutely nothing with the ryetalyn.
Why didn't McCoy go with M4 to get the ryetalyn in the first place? Instead, he decides to go with Flint when the first ryetalyn is useless.
Kirk peers in through the front of the ship and he acts like he can see the bridge - the viewscreen is like a television screen, it's not a window - he shouldn't be able to see anything.
Rayna the android collapses - McCoy knows what she is and yet still goes over and feels for a pulse.
Exactly how much does that miniature Enterprise weigh? The desk it's on must be very sturdy. Alternately, what did Flint do with the tons and tons of extra weight and how does he put it back when he puts the Enterprise back in orbit?
At the end when they finally find the ryetalyn, McCoy hangs around with the important, live-saving cure for the dying Enterprise crew and explores Flint's robot room, watches Kirk and Flint slug it out, etc., rather then... get up to the ship and save the crew.
Kirk seems curiously unprofessional in his pursuit of Rayna and handling of the matter - his whole crew is dying from the plague and he's hitting on her repeatedly. Did Flint slip Viagra into the Captain's drink?
Kirk: Stay out of this, Spock! We're fighting for a woman!
Spock: No you're not, Captain, for she is not!
McCoy: You wouldn't understand that, would you, Spock? You see, I feel sorrier for you than I do for (Jim)...because you'll never know the things that love can drive a man to: the ecstasies, the miseries, the broken rules, the desperate chances, the glorious failures, the glorious victories. All of these things you'll never know...simply because the word "love" isn't written into your book. Good night, Spock.
Spock: Good night, Doctor.
Kirk: Restore them. Restore my ship!
Flint: In time: a thousand, two thousand years. You will know the future, Captain Kirk.
Kirk: You have been such men! You've known and created such beauty. You've watched your race evolve from cruelty and barbarism...throughout your enormous life, and yet now you would do this to us?
Flint: The flowers of my past. I hold the nettles of the present! I am Flint now, with my needs.
Flint: Be thankful that you did not attack me, Captain. I might have accepted battle, and I have twice your physical strength.
Kirk: In your own words, it would be "an interesting test of power."
Flint: How childish he is, Rayna. Would you call him brave or a fool?
Rayna: I'm glad he did not die.
Flint: Of course. Death, when unnecessary, is a tragic thing.
Kirk: Indeed, your greeting, not ours, lacked a certain benevolence.
Flint: The result of pressures which are...not your concern.
Kirk: Yes. Well, those pressures are everywhere in everyone, urging him to what you call savagery: the private hells, the inner needs and mysteries, the beast of instinct. As human beings, that is the way it is. To be human is to be complex. You can't avoid a little ugliness...from within and from without.
McCoy: Saurian brandy, 100 years old. Jim? Please. Mr. Spock, I know you won't have one. Heaven forbid those mathematically perfect brain waves be corrupted by this all-too-human vice.
Spock: Thank you, Doctor. I will have a brandy.
McCoy; Do you think the two of us can handle a drunk Vulcan? Once alcohol hits that green blood...
Spock: If I appear distracted, it is because of what I have seen. I am close to experiencing an unaccustomed emotion.
McCoy: I'll drink to that. What emotion?
McCoy: Have you ever seen a victim of Rigelian fever? They die in one day. The effects are like bubonic plague.
Flint: Constantinople, summer 1 334. It marched through the streets, the sewers. It left the city by ox cart, by sea, to kill half of Europe: the rats, rustling and squealing in the night as they, too, died. The rats...
Spock: Are you a student of history, sir?
Flint: I am.
Kirk: Kirk to Enterprise. Mr. Scott, lock phasers onto our coordinates.
Scotty: Aye, Captain, all phasers locked on.
Kirk: Mr. Flint, if anything happens to us, four deaths. And then my crew comes down and takes that ryetalyn.
Flint: An interesting test of power: your enormous forces against mine. Who would win?
Spock: Mr. Flint, unless you are certain, I would suggest you refrain from a most useless experiment.
Rayna: What is loneliness?
Flint: It is a thirst... it is a flower, dying in a desert...
Flint: To be human is also to seek pleasure. To laugh... to dance.
Flint: The intellect is not all... but its cultivation must come first, or the individual makes errors... wastes time in unprofitable pursuits.
Spock: The joys of love made her human and the agonies of love destroyed her.
Flint: I... am Brahms.
Spock: And DaVinci?
Spock: How many other names shall we call you?
Flint: Solomon, Alexander, Lazarus, Methuselah, Merlin, Abrahmson – a hundred other names you do not know.
Spock: You were born?
Flint: In that region of Earth later called Mesopotamia in the year 3834 BC, as the millennia are now reckoned. I was Akharin; a soldier, a bully – and a fool. I fell in battle, pierced to the heart... and did not die.
McCoy: Instant tissue regeneration, coupled with some perfect form of biological renewal – you learned that you were immortal!
Flint: And to conceal it. To live some portion of a life. To pretend to age, and then move on before my nature was suspected.
Spock: Your wealth and your intellect are the product of centuries of acquisition. You knew the greatest minds in history:
Flint: Galileo, Socrates, Moses. I have married a hundred times, Captain. Selected, loved, cherished. Caressed a smoothness, inhaled a brief fragrance. Then age, death, the taste of dust. Do you understand?
Injoke: Writer Jerome Bixby gave Rayna the last name of Kapec, a reference to Karel Čapek, who created the word "robot" for his 1921 play R.U.R. (Rossum's Universal Robots). Despite that, the mechanical beings seen in the play are androids rather than the modern definition of robots. In fact, they are biological constructs not dissimilar to Rayna.
The shot of Flint's home (in the original version) is the shot of the fantasy castle seen in "The Cage/The Managerie." In the re-mastered version in 2008, a new digital matte was created.
A repeat of this episode on September 2, 1969 marked the end of Star Trek's original run in NBC Primetime.
Flint mentions a number of famous people who were all him. Johannes Brahms was a German classical composer who lived from 1833 to 1897. Leonardo DaVinci was an Italian painter and inventor, most famous for his depiction of The Last Supper and for the enigmatic Mona Lisa. He lived from 1452 to 1518. Methuselah was a Hebrew patriarch who, according to Biblical sources, lived for nine hundred and sixty nine years. Merlin is most famously associated with the tales of King Arthur, and was anything from a prophet to a wizard, depending on whose account one reads.
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