Corrected entry: At the start Taylor disappears into a rock face, but the long shot after shows no such rock face, only desert and the woman on the horse.
Corrected entry: Taylor states that a nuclear bomb with a Cobalt casing, when detonated, would result in Earth's atmosphere being destroyed. In reality, a Cobalt-cased nuclear bomb wouldn't be any more powerful than a normal one; the only difference would be that the fallout radiation would remain lethal for several decades, rather than a few months.
Corrected entry: Throughout the "Planet of the Apes" movies, chimpanzees are portrayed as peaceful pacifists, while gorillas are prone to violence. Later scientific discoveries after the film was released proved (at least in some respects) the reverse: while gorillas are the more peaceful apes, getting violent only to protect their families or territory, chimpanzees have been found out to eat meat as well, attacking and dismembering small animals and even monkeys.
Corrected entry: In the scene where Taylor and Brent escape from the cell, just before Nova dies, Charlton Heston has a club in his hand and takes one off the wall handing it to Brent. This is shown to be the last club on the wall, but in the next shot there is a club hanging on the wall behind them in the same spot, yet Taylor and Brent each have one too.