Star Trek: The Animated Series

Time-travelling Spock establishes himself with the cover story of being a distant relative (which everyone accepts so must be true), but later tells his younger self that he also has human blood. In the show Spock has always been presented as the first, unique half-Vulcan/half-Human. Wouldn't young Spock think it odd that thee were another half-Human Vulcan when he's the first?

The Le-Matya's head briefly disappears when Spock applies a nerve pinch.

Thelin's skin is greyish-pink: Andorians in the series have blue skin.

When the alien ship's bridge starts to explode, Kirk and the others are lying on the ground. When they materialize back on board the Enterprise they are standing up.

When the landing party beams over to the alien ship, in a number of shots the yellow force field "outline" is badly off-center, with gaps on the left or right and an overlap on the character body on the opposite side.

Kirk tells Sulu to use the "mutual override" to regain control of the ship. The term he should use is "manual override."

Arex is shown seated at the navigator position next to Sulu for the most part, but in several shots a brunette red-shirt is seated in the position instead, before the camera cuts back and Arex is there again.

When Kirk orders the forward scanners on to see the dead star, the viewscreen "whooshes" and slides open vertically, as if there is a shutter over it. It is not a shuttered window.