Other mistake: In the original theatrical trailer, Stephen King's name is misspelled as "Steven."
Suggested correction: Does a theatrical trailer error count as a movie mistake?
Continuity mistake: When Joseph stumbles into the road, Burt hits him with his car. In the initial shot we see that Joseph's body had landed in the middle of the road on a yellow line. In a following shot, his body is now seen to be by the side of the road. (00:15:35)
Suggested correction: He didn't stumble. He was standing.
This isn't a valid correction. Make a word change if you think it needs to be more specific, and you can stumble and still be standing.