Star Trek (1966)

The Empath - S3-E12

New this week Plot hole: Spock calculates that it will take 72 hours for the solar flare to pass, and Kirk orders the Enterprise out of the area. 3 days is a long time to go without food or water, and as the station is deserted as far as they know, there'd be no way to supply themselves, but the Enterprise leaves without a second thought.

The City on the Edge of Forever - S1-E28

New this month Continuity mistake: When trying to catch McCoy, Kirk's pants get dirtied. After coming out of the Guardian's time portal in the Depression, his pants are clean.

Assignment: Earth - S2-E26

New this month Character mistake: Mr Seven calls the security guard "Sergeant" but he is a corporal.

The Immunity Syndrome - S2-E18

New this month 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.

Errand of Mercy - S1-E26

New this month Character mistake: When Kor describes the effects of the mind-sifter to Kirk (who is still in disguise as an Organian), he says the machine would leave him "more vegetable than human." There is no reason a Klingon would reference humans while speaking to a person he believed to be Organian.

A Piece of the Action - S2-E17

New this month Revealing mistake: The drawers of Krako's desk are on the front side, not on Krako's side where they should be.

The Apple - S2-E5

New this month Visible crew/equipment: When Kirk is talking to Scotty there is a shadow of someone's head on Kirk's shirt.

The City on the Edge of Forever - S1-E28

New this month Factual error: Spock picks a lock during the great depression, but the lock is from the late 50's.

For the World is Hollow and I Have Touched the Sky - S3-E8

New this month Plot hole: Spock says the spaceship asteroid will collide with Daren 5 in 396 days, but without knowing the exact location of Daren 5 at that moment it would be impossible to predict a collision.

I, Mudd - S2-E8

New this month Plot hole: How did the android Norman get aboard the enterprise? If he beamed aboard I'm sure someone would have noticed and where did he beam from? The Enterprise was nowhere near any planet and I'm sure they would have detected any spacecraft nearby.

The Doomsday Machine - S2-E6

New this month Plot hole: Commodore Decker takes over command of the enterprise but Spock says if McCoy can certify him incompetent (which he obviously is) he can be relieved of command. McCoy says he will certify him now, so why doesn't he? In other episodes it has been stated that McCoy can order anybody regardless of rank to an examination to see if they are physically or mentally fit.

Tomorrow is Yesterday - S1-E19

Continuity mistake: When Kirk and Sulu enter the records room, they pick the lock. Later when they beam the officer back down, he enters the room without unlocking the door. The room should be locked since they beamed him down in the "past" erasing their having been on Earth and in the records room.

The Enemy Within - S1-E5

Revealing mistake: When Kirk beams up from the planet, the insignia on his shirt is not there.

Garlonuss

Show generally

Plot hole: "The Cage": Pike says he doesn't want women on his bridge, Number One being the one and only exception, and he keeps ordering Colt off it. His apology to Number One indicates that A)he doesn't think of her as female, and B)she's the only exception to his rule. So how does he overlook the very female crew-woman seated at the science station? (00:06:55)

Show generally

Deliberate mistake: Special effects of the ship in space were very expensive in the 60s and couldn't be wasted. So when a larger model was built with slightly different nacelles, shots of both versions became common, even within the same episode. This is why the Enterprise sometimes had red needle-tipped nacelles and sometimes lighted "spinning" ones, and in aft views she had either round white spheres or perforated vents at the nacelles' ends.

Shore Leave - S1-E15

Visible crew/equipment: You can see the shadow of a boom mike on a tree just after the Caretaker appears.

Charlie X - S1-E2

Continuity mistake: When Capt. Kirk and Charlie enter the turbolift heading for the bridge, Kirk is wearing one style of tunic and when the turbolift arrives on the bridge, Kirk is wearing a completely different tunic.

Show generally

Visible crew/equipment: "The Cage": When the doctor is mixing the drink and Pike gets up off the bed to accept it, an equipment shadow sweeps across the left side of the screen. (00:03:55)

Devil in the Dark - S1-E25

Revealing mistake: A straight and level seam connecting the top and bottom halves of the tunnel Spock is crawling through is visible.

Tomorrow is Yesterday - S1-E19

Factual error: Towards the end of the show the Enterprise is leaving Earth orbit and heading towards the sun. We see the Earth diminish and the moon appear looking exactly as it does from Earth. From this angle we should be seeing the "dark side" of the moon, which looks completely different. (00:40:50)