Kyle wears #4 on both of his uniforms, but is called #8 when he substitutes for #11 at the all-state playoffs. (For the second airing on Comedy Central, however, the announcer does say #4.)
At around 18 mins, when the Star-Spangled banner is being sung at the game, the first shot does not include the players at all. The second shot shows the players, but Kyle is pre-operation. A few seconds later, Kyle is shown again, post-operation.
The water coming out of Gerald's blowhole changes color as it touches the carpet.