Revealing mistake: When McCullough is discussing Prudy's oddities with the matronly lady out front of the mayor's house, it is obvious that the lady is standing on a dirt-covered concrete sidewalk.
Revealing mistake: In the opening sequence when Sundance shoots the gun belt off the card player, the film was cut to make the quick draw appear faster. You can see Butch's image jump across the screen in the background.
Revealing mistake: In the scene where the town is collapsing, there is a shot of Ben in the bathtub falling into the river, if you look closely, you can see the strings that are keeping the tub steady and upright.
Revealing mistake: Near the end of the movie, the Bunch are relaxing and passing around a bottle of whiskey. While the actors could not be expected to drink real alcohol, it's too bad the prop guy could not have mixed up some less foamy instant tea, typically used as a substitute in these scenes.
Revealing mistake: The first time we see the artillery blow up a group of Confederate soldiers, the guys wear pretty distinctive hats; the one at the center has a red band on it, the one to his right a straw hat, etc. Ten seconds later, the artillery blows up another group of soldiers...who are the exact same group from before. It's just another take. (00:00:30)