When Phil & Buck are in the basement playing darts, Buck throws a bullseye, then pulls his darts from the board, thus leaving the board free of darts. Phil's first ensuing throw lands in the neon sign, breaking it. Buck throws his dart and lands a bullseye, but there are two other darts in the bullseye circle in the close-up.
When Phil calls the team to the picnic benches after describing how they are slothful to Ditka, it is clear that the Goalie (Ryan) is one of the first to run over and sit down on a bench. In the next shot of the team, the Goalie is still walking to the bench.
When Byong Sun gets the ball when the team was passing the ball around the circle and introducing themselves, his hands are behind his back. As the shot changes, you see his hands in front of him. As the shot changes again, his hands are behind his back again.
When Phil is calling Ditka a juice box guy the camera changes back and forth from each of them. Ditka's reaction at first is calm then angry then calm and then angry. When the camera goes back and forth on him you can see that as Phil is talking he is calm then when the camera is on him he is angry.
During a normal soccer game, players are not allowed to kick the ball up to and behind their necks and "carry" the ball in that manner. Also when the player lifted his team mate to head the ball into the goal is not allowed. Either of these infractions fall into dangerous play or unsportsmanlike behavior resulting in a yellow card (warning) or red card (ejection from game)
In the Champioship game, Phil subs Gian Piero & Massimo off at half-time then later brings them back on. This would not happen in real life, once a players is subbed in a football match he/she may not come back on.
When Umberto agrees to let Gian Piero and Massimo play soccer, Maria (the woman next to Umberto) claps her hands and looks at the kids. In the next shot, she has a Sharpie pen in her hand and is in a completely different position.