Los Angeles can be glimpsed in the background as Nona confronts the villagers with the phaser.
When Kirk, Spock, and McCoy beam back to the ship in the beginning of the episode, Scotty is in the transporter room with them, and no one is apparently in command on the bridge when a red alert is signaled. When Kirk gets to the bridge, no one is in the captain's chair for him to relieve.
In the closing credits, the Mugato is listed as "The Gumato." Reportedly the creature was originally named "Gumato" in the script, but Shatner mispronounced it as "Mugato" and they kept that name.
Scotty said that the first firearm that the inhabitants would develop was the flintlock rifle. Actually the first firearm they should have developed would be the matchlock.
Right after Spock is shot, the trio beam back up to the ship. During transport the equipment next to McCoy disapears but it doesn't have the glitter effect that usually appears.
After Nora heals Kirk and lies down, you can see that she's wearing pumps.
The Mugato leaves the same footprints as the White Rabbit in the episode "Shore Leave" (they used the same footage). There's the same problem here, too - the footprints are parallel to each other, which only makes sense if the Mugato is hopping rather then walking.
They forget to dub in the communicator beep at the end - Kirk and McCoy are talking and suddenly they both "react" and McCoy pulls his communicator out, even though there is no signal-beep.
More sound-dubbing - when the villagers shoot at Kirk, McCoy, and Tyree, there's a powder-burst or two near them at the end but no richochet noise.
Kirk: Spock, ask Scotty how long it would take him to reproduce 100 flintlocks.
Scotty: I didn't get that exactly, Captain. 100 what?
Kirk: A hundred serpents. Serpents for the Garden of Eden. We're very tired, Mr. Spock. Beam us up home.
Kirk: Research is not the Klingon way.
M'Benga: Don't let these low panel readings bother you. I've seen this before in Vulcans. It's their way of concentrating all their strength, blood, and antibodies onto the injured organs. A form of self-induced hypnosis.
Chapel: You mean he's conscious?
M'Benga: Well, in a sense. He knows we're here and what we're saying, but he can't afford to take his mind from the tissue he's fighting to heal. I suppose he even knows you were holding his hand.
Chapel: A good nurse always treats her patients that way. It proves she's interested.
Apella: I thought my people would grow tired of killing. But you were right - they see it is easier than trading. And it has its pleasures. I feel it myself. Like the hunt, but with richer rewards.
Kirk: We once were as you are. Spears and arrows. There came a time when our weapons grew faster than our wisdom, and we almost destroyed ourselves. We learned from this to make a rule during all our travels never to cause the same to happen to other worlds... just as a man must grow in his own way and his own time.
Nona: Some men never grow.
Kirk: Perhaps not as fast or in the way another thinks he should. But we're wise enough to know that we are wise enough not to interfere with the way of a man or another world.
Kirk: War isn't a good life, but it's life.
Kirk: The only solution is...a balance of power. We arm our side with exactly that much more. A balance of power... the trickiest, most difficult, dirtiest game of them all. But the only one that preserves both sides.
Kirk: We are wise enough to know we are wise enough not to interfere with the way of a man or another world.
Nona: There is an old custom among my people. When a woman saves a man's life, he is grateful.
Story writer Don Ingalls is credited under the pseudonym Jud Crucis.
Gene L. Coon who co-wrote this episode is not given writing credit.
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