Revealing mistake: Most of the posed, fake displays in the ape's Museum of Natural History contain real people who are slightly moving if one pays careful attention. Especially noticeable are those posing with objects held in - or above - their hands.
Continuity mistake: When Dave gets his supper, the order of the slop from right to left is yellow, light brown, light brown, dark brown. Later when he's eating, the order is yellow, orange brown, dark brown, light brown.
Continuity mistake: A scene is shown where the zombies smash the headlights of the truck that Ben arrived in. Later in the movie, when they attempt to refuel the truck, both headlights are fully intact and lit.
Continuity mistake: When Barbarella first has to go down for an emergency crash landing, she puts her right arm up to her head in panic. However in the next shot it is her left arm that is up to her head instead of her right.
Continuity mistake: When doctor Nemur, that other doctor, and Mrs. Kinnian are discussing possible complications with Charlie's surgery, there's one shot where Dr. Nemur takes the cigarette out of his mouth and in the next shot it's back in.