Corrected entry: In the scene where Chip Douglas breaks the backboard in the basketball game, he thanks Rick for the "boost". If you look at Rick and his friends walking away in the first shot, both elbows are bent with his hands on his above his waist. In the next cut (after Carrey thanks him), his left arm is in a very strange position all of a sudden. (00:25:39)
Corrected entry: In the scene where Chip breaks the basketball backboard glass, if you look closely while the glass is falling, you can see some of it floating, revealing that it was some kind of fake material used.
Correction: None of the glass is "floating", but the close-ups of Chip are in slow motion, so here it may appear that the glass falls slower than in other shots.
Corrected entry: During the basketball game Chip comes in after one player gets an injury. Before they even tell him what the teams are, they start playing again. (00:22:20 - 00:23:35)
Correction: Chip tells Jack Black's character that he is on Steven's team before they start playing, and then they give him time to warm up. During this time, they spread out and stand in two separate groups, one per team. All Chip had to do was look at who Steven was standing beside to know who was on his team. And since Chip is a stalker, he more than likely already knew who was on Steven's team, as he followed them to the gym.
Correction: His arm is not in a "weird position", he is merely holding out from his body. The change between him holding his hand on his hip and holding it out, is after an angle change where Rick is out of frame for a second, enough time for him to move his arm.
Twotall