Other mistake: When Joe shoots the person at the beginning of the movie the character is played by Bing Russell (Kurt's father). Later in the movie when Dude is ambushed at the entrance to the town, they give a guy his hat to impersonate Dude - it's Bing Russell again, after he was killed off at the beginning and why Joe is arrested in the first place.
Other mistake: When Wheeler is walking down the street, the view is from behind a man with a rifle at a window. When he shoots it is obvious the rifle was pointing to the far right of Wheeler. (00:44:00)
Other mistake: When the Mexican girl yells for help she is only a couple of rooms from where Chance is yet Chance runs downstairs to rescue her.