Continuity mistake: Near the end of the race, the cars are clean and dirty in the same race lap.
Deliberate mistake: While on the sideline during a game, Sayers tells Piccolo that he should ask Dr. Fox to give him something for his hay fever, and Piccolo heads back to the field. The next closeup of Sayers is a flipped shot; note the "40" on his jersey. (00:41:55)