Continuity mistake: In the scene where we see school children leaving the building and are going home we see two children go over to the see saw to ride on it. Buffalo Bill is talking to a little girl just outside the doorway and when it cuts in for a closer shot of the girl, you can see in the background there are now four children on the see saw; then again when the little girl starts walking home its back to the original two children who were on the see saw earlier on.
Factual error: As the train with Wilson aboard pulls into a town toward the end of the movie the year is 1919. Through the window of the train, looking out into the parking lot, there are two cars from the mid to late 1930s.