गूफ़

When Leo enters the delta pod, he puts on his helmet and it loosely touches the collar of his spacesuit. In the next shots it fits perfectly in the collar.

The scratch on Leo's neck swaps sides and disappears randomly.

When Thade's niece buys their human pet, the bolt on the cage is left out. In the next shot, it's bolted shut again.

As Leo begins to enter the water with Ari on his back, she puts her hands over his face. In the next shot from further across the water, they are by his side. The hands return over his face once they are in the water.

When the chimp is taking off from the ship you see Leo with his hands behind his back. In the next shot you see them at his side.

Chimpanzees, gorillas, and orangutans are apes, not monkeys. The script incorrectly uses the term monkey several times (spoken by characters who should know better), but there are no monkeys in the film.

The term "monkey" is used throughout as a demeaning or dismissive term, and the film makes it clear that this is offensive to the apes during the scene when Krull admonishes Leo for using the epithet while clearly stating that apes and monkeys are different.

When Leo and company come out of the lost city, there's a shot from some distance, back at the ship. Look to the far right and you will see a road with clear tire tracks on it.

When Leo is holding the branding iron close to Ari's face, the hot part of the iron is obviously painted orange to appear hot, and stays that color way too long.

After the chimp gets into his cage, we see an ape with his makeup incomplete.

As Leo and company escape the city through the tunnels, they break through some boards covering the tunnel exit. One of the boards has been clearly sawed through and is broken at that point.

When Thade forces Davidson's mouth open and looks in, a metal crown can clearly be seen. This should have been noticed by Thade.

During the final battle, studio lights are reflected on Thade's helmet.

After the refugees cross the river, they set up camp and make fires. They are in the middle of the desert and there are no trees as far as the horizon. Where did they get the firewood?

The chimpanzee in the pod that is launched at the beginning is shown in a full spacesuit except he is not wearing any gloves.

(at around 5 mins 20) Grace Alexander asks "Was the Homo sapien mean to you?" instead of "sapiens". The final "s" is distinctly missing (also in the subtitles) in the scientific way Lt. Col. Alexander talks about the "human" Davidson.