Other mistake: The protagonist uses his belt to temporarily fix the movie projector. He has to keep his pants on with his hands, but that's only until he has to grab an object and the pants do drop. Then he is still belt-less but the gag ran its course and his pants are not falling off anymore, once was enough.
Other mistake: During the montage for Ross Rhea, there's a clip on the teleprompter showing Ross fighting multiple members of the other team. In the clip, Ross is shown playing for the St. John's Shamrocks and fighting members of the Québec team, but the score ticker at the top of the screen shows the score "MTL 5 BOS 2", two teams in another league that have nothing to do with the game being played. (01:01:10)