Deliberate mistake: All Minor Hockey Leagues in North America require players to wear visors with their helmets.
Factual error: Hockey player Derek Thompson is nicknamed "Tooth Fairy" because he often knocks out the teeth of opposing players. His car license plate reads #1 TOOTH. In Michigan, where the movie takes place, the symbol # is not available for use on a license plate.
Derek Thompson: You can't handle the Tooth! And that's the Tooth, the whole Tooth and nothing but the Tooth! I pledge allegiance to the Tooth.
Trivia: When the goalie is scared away by Billy Crystal during the end credits, he yells the Wilhelm scream.
Answer: It was all Black Market merchandise. Usually not of any good use; total rip-off.