Who Mourns for Adonais? - S2-E2
Other mistake: The bushes behind the temple shimmer in time with the temple when the ship is firing on it, but they aren't connected to it.
Other mistake: When the Planet Killer hits the Enterprise, the ship lurches 45° to starboard, and the crew fall accordingly. However, the chairs, except for the communications station, stay in place.
Other mistake: When Norman goes to the second panel in Auxiliary Control, there is clicking when he turns his right hand, but there is no knob, just a blinking light.
Other mistake: The action is shifting back and forth from the bridge where the alien ship is attacking and sickbay where McCoy is operating on Sarek. In two separate takes when the scene shifts to sickbay McCoy is standing at the operating table. I noticed a wisp of smoke rising from McCoy's right side (left side of screen). It appears to be from a cigarette in an ash tray below camera level either beside McCoy or near the head of Spock's bed.
Suggested correction: This was an intended physical effect to simulate the cryogenic surgery that McCoy was performing on Sarek.
Other mistake: In the scene near the end when Kirk orders Kyle to beam Hengist into space, Kirk and Kyle say their lines in the wrong order. Roughly: Kyle: Don't get excited, Captain. I would have done it. Kirk: Spock, you do it.
The Gamesters of Triskelion - S2-E16
Other mistake: When Kirk agrees to fight in the arena at the end of the episode, he and the thralls are warned that touching an opponent's color will result in the loss of a weapon. Kirk does this several times during the fight, but isn't penalized in any way.
The Gamesters of Triskelion - S2-E16
Other mistake: Kirk tosses the Andorian, and as he hits the ground, his shirt comes up and the man's real skin tone is visible.
The Immunity Syndrome - S2-E18
Other mistake: As McCoy stands by the hangar deck doors, the plaque over the pressure controls has "hangar" misspelled. It says "hanger".
The Immunity Syndrome - S2-E18
Other mistake: When the probe emits a loud high-pitched tone, everyone is in pain, with the exception of Mr. Spock, who is supposed to have super sensitive hearing.
Suggested correction: Spock has also been shown to be able to control his own pain.
Other mistake: In the cells, the particular strip of metal Kirk pulls loose has rivets that are noticeably different than the rest, making it easier to pull loose.
Other mistake: Early on, there is a shot of the control room. There is a read out that is counting down from "5 04 15", meaning that the launch would be in just over five hours, not less than one minute.