Other mistake: After Sonny is shot on the causeway, there are a very large number of bullet exit holes visible on the sides of the tollbooths, which could only have been made if the gunmen shot through the walls (not the windows) of the buildings from the inside. This is common in movies. In real life, bullet entry holes in wood appear as small black dots, not the more dramatic-looking splintered gashes made on the other side of the wood as the bullet exits. (01:52:40)
Other mistake: In the shot where the men are playing a game of baseball, if you look carefully in the background you will see that cars are driving down the highway. Considering that this movie was supposed to take place in the 1800's...
Other mistake: In the scene where Kidd is in the watchtower getting ready to smash the guy in the head with the water jug. When he lowers it, it looks to be about 3/4 full, but when it smashes the guy in the head, about a cup of water comes out.
Other mistake: When the gunman is sitting in the boss' office, the morning after failing to bring Bruce to him, he is shown with a black eye, band aid on his forehead, and the other eye swollen - despite only receiving strikes to the midsection by Bruce the night before.
Other mistake: During the ‘rescue' mission to save the trapped wagon train, none of the riders are carrying packs of food or any supplies. One man is carrying a military unit banner on a pole. Unrealistic for this type of activity.
Other mistake: The film is set in 1931. One of the characters uses the phrase "plenty of nutting." This phrase comes from the song composed three years later in 1934 for the musical Porgy and Bess.
Other mistake: We know that, after Cornelius and Zira were executed at the end of the previous movie, "Escape from the Planet of the Apes," baby Caesar was only an infant who was just starting to say "Mama." In "Conquest," we know that 20-year-old Caesar was raised (and secretly educated) by Armando, the circus owner. But, after 20 years of being raised and secretly educated by Armando (who has a thick Mexican accent), Caesar has a distinct British accent.Charles Miller
Other mistake: When Stan is towing Arthur's motorbike and sidecar behind the bus the tow rope was attached to the handle bars, when the handle bars come off, the bike naturally breaks away from the bus and rolls off on its own, but it is going back the way it was when it was being towed. The bike couldn't have turned 180 degrees with no handle bars to steer it.