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Continuity mistake: After Zaius warns Taylor not to go to the Forbidden Zone, Taylor turns the horse to face Cornelius. In the closeup after Zaius tells Taylor "You may not like what you find", he turns the horse around again.

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Continuity mistake: After Taylor dismounts the second ape, he attacks the ape, and the whip/rope used is dropped and Taylor is a few feet from it. In the closeup, he suddenly has it in hand.

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Revealing mistake: After Taylor gets up from being dragged in the square, another ape tries to rope him. As this occurs, the stuntman is easily distinguished.

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Question: Since World War 3 was the cause of the nuclear devastation, as evidenced in Beneath the Planet of the Apes, how is it that Dr. Zaius doesn't know the full story of the rise of the apes over the humans? Wouldn't the story be passed down?

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Other mistake: As the Apes first appear on horseback, as the second one from the camera's left turns around, you can see that the rifle doesn't have an ammo clip in it.

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Other mistake: After the rocket hits the water, the view of the landscape bobs up and down. But the movement at the top and bottom of the view are slightly jerky rather than the smooth stop and go that a real bobbing craft would have.

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