Continuity mistake: When the Horsemen team are ready to play the start to skate up to the arena. You see a back view and Jonathan clearly doesn't have his white T-Shirt over his black suit. They cut to someone else then back to the team and Jonathan clearly has his white shirt on.
Continuity mistake: In the final game, Jonathan (Chris Klein) skates up and punches Halloran, the big guy that plays for the horde. Halloran turns and punches him twice, knocking Jonathan's helmet off. We then see another player stroll up and hit Jonathan in the back with a piece of gear, and his helmet is magicly back on.