When Richie and his dad are playing cards at the frat house, they are playing with a deck that has red backs. Once the stakes are lifted, Howard then introduces a clean deck with blue backs to replace the marked red-backed one. However, as he does the ribbon spread and turnover before the first hand is dealt, the viewer can see there are two blue-backed cards already underneath a blue chip in front of Howard.
At the frat house, when Howard breaks out his deck of cards and does a few tricks, the overhead camera shot shows other cards and chips on the table in different positions than other shots.