Continuity mistake: The blood dripping from Isak's mouth changes sides.
Revealing mistake: During the televised fight, in the wide angle shots, you can tell it's Spock's stunt double fighting.
Continuity mistake: As Gary Seven starts to talk to the computer, it has a light gray exterior. When it first talks, the trim turns purple, then it's back to light gray.
Character mistake: When Kirk turns to face Spock and McCoy to introduce them to Sarek, the hangar deck nameplate on the wall is misspelled. It reads "hanger deck".
Character mistake: Mr Seven calls the security guard "Sergeant" but he is a corporal.
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.
A Piece of the Action - S2-E17
Revealing mistake: The drawers of Krako's desk are on the front side, not on Krako's side where they should be.
Continuity mistake: The second time McCoy is shown in the Sickbay, he is first shown sitting and writing. A moment later, he's standing bent over the terminal.
Continuity mistake: In the dining hall, Korab leans over to listen to his cat. As he does, his right hand is at seat level. A second later, his right hand is up by his shoulder. (00:22:20)
Continuity mistake: In most shots, the Constellation's impulse engines are lit up orange, but when moving to meet the Enterprise, they're not lit up, though the ship is moving.
Continuity mistake: Spock nears the command chair, where a seated Decker is leaning on the left armrest. A second later he is leaning to the right.
Continuity mistake: An Orion spy (disguised as an Andorian) attacks Captain Kirk in the corridor on Deck 5 and plainly stabs Kirk in the back on the right side. As he staggers to his feet, Kirk first reaches to the wound with his right hand, indicating that it is, indeed, on the right side of his back. He then reaches far across his back with his left hand to touch the wound, and we see blood on the back of his hand (but not on his sleeve). So, it is visually established that the wound is on the right side of his back. But, a few moments later in SickBay, Dr. McCoy announces that Kirk's wound is a "puncture to the left lung." Then, later in the episode, Kirk his holding his left arm as though he is suffering pain on the left side.
Continuity mistake: The chain symbol on Kirk's shirt goes from dark to light and back several times.
Continuity mistake: Kirk is holding the communication device out to his right from his view of the Companion and Cochran's, but the next instant shot shows Kirk holding the device close to his chest as he speaks with the Companion.
Continuity mistake: The designs of the fabric the Companion holds up to view Cochran are different from her view versus the view from Cochran's.
Continuity mistake: As the team of 4 energize from Enterprise to go to Exeter, the positions of Spock and Lt. Gallway are altered as they re-emerge on the other side.
Continuity mistake: In sick bay, close ups of Sarek show him sitting up at a 90 degree angle, but the long shots show him reclining at a 45 degree angle as the shots cut away and back.
The Ultimate Computer - S2-E24
Audio problem: After trying to change course, Sulu calls Kirk. Kirk says "Kirk here", and then you hear the click of the comm button being hit.
The Gamesters of Triskelion - S2-E16
Revealing mistake: When Kirk goes to kick his opponent, you can see the kick was at least a foot and a half from the man.
