When Ralph is flying after the brown sedan, the backgrounds don't match up with where he crash lands. While he's flying the background is of a busy multi-laned city street, but then he is shown landing on a quiet residential street. He takes off again and they show the busy street under him, but then the scene cuts to an empty desert landscape where he crashes again.
The school van side doors are already open when Ralph and the students walk back to it after seeing the Lone Ranger. They had been closed when they parked and walked away from it earlier.
When Ralph is tying up the bad guys by running around them with a rope, the number of the loops of rope varies between shots.
Maxwell describes the getaway car in the opening scene as a tan sedan when he radios Ralph., but it is a dark brown color. In the next scene when Ralph crashes into a tree next to a cop, he tells him they need help catching a brown sedan.. He couldn't know the sedan was brown since he never saw it and Maxwell told him it was tan.