Revealing mistake: When Ursus is giving his speech in the Ape city, many of the Chimpanzees and Orang-utans are wearing incredibly fake-looking masks. (00:17:15 - 00:19:50)
Revealing mistake: When Brent is attempting to get the reins for the horses after escaping his wheeled cell, you can see a second set of reins going through the wooden holes to where a driver is hidden. When he gets the fallen reins, the second set is no longer there. (00:38:00)
Revealing mistake: When Brent is shot dead, the blood pack is visible on his chest, poking out from under his bandaging. (01:29:15)
Revealing mistake: When Ongaro is pushed up against the spikes on the cell bars, the spike against his neck is shown wobbling like rubber. (01:18:50)
Revealing mistake: When Nova says "Taylor" whilst Taylor and Brent are killing each other, Ongaro turns around and Taylor goes to punch him. Taylor's punch completely misses Ongaro, but Ongaro still reacts anyway. (01:18:45)
Revealing mistake: As Brent and Nova run away from the apes, they get caught in a net. You can see they are both wearing shoes, even though they are supposed to be barefoot. (00:31:45)
Revealing mistake: Linda Harrison's metallic dental implant is rather noticeably visible during her closeup on her signature line, "Taylor!"
Chosen answer: The mutated humans (the ones with the bomb) have telekinetic powers and projected the image into Taylor's mind, the same way they did with the fire with the apes.
Bishop73