Continuity mistake: At the end when Big Ern is taunting Roy, he starts shaking his arms when "Showdown" starts. He is standing up in the shot before. In the next shot he starts standing up and repeats the action.
Factual error: There is no Brimfield in Pennsylvania. The Lancaster Bowl employee tells Roy that Ishmael is from an Amish community in Brimfield. (00:19:39)
Suggested correction: Films, TV shows, and books regularly make up city names that don't constitute mistakes.