Continuity mistake: The first exterior shots of the spacecraft in the desert lake show the spaceship's hatch door already gone... before the astronauts blow it off with an explosive charge minutes later in the movie.
Trivia: During breaks, the ape makeup couldn't be removed. It is interesting to note that the chimps naturally hung out with other chimps during breaks, the gorillas natually hung out with other gorillas, and the orangutans naturally hung out with other orangutans.
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