Students at W. Charles Akins High School were not allowed to be extras in the film despite the fact that the film was partially shot there. This was because extras were required to be at least 18 years old, and at the time Akins' only had 9th and 10th grade students. However, several teachers and staff of Akins High School got to be extras.
When Kirk lets go of the motorcycle and it crashes into the garage door the front wheel is on the left, but when shown from the reverse angle the front wheel is still on the left when it should be on the right.
At the first football game that Gil goes to, the announcers
say that that was the first win since the last Bush was president. Then, when Gil goes into the office and the coach and the principal are thanking him for all he did, the coach then states that it was their first win in five years. The movie was made in 2002 when George W. Bush was president, five years before that Bill Clinton would be president, not George Bush.
What are the differences between the Theatrical Version and the Director's Cut?
The Director's cut of "The New Guy" has only been released in the US so far. It contains some cuts for the PG-13 and also two new plot scenes which feature DJ Qualls as William Wallace (not Patton) already in the first football game. A detailed comparison between both versions with pictures can be found here.