Since shooting took place during the actual school year in an existing high school, the crew had to ask students for permission to use and re-dress their lockers for shooting.
The idea of John Tucker wearing a thong was not in the original script. Originally, Kate talked him into shaving his head. Betty Thomas thought making him wear a thong was funnier. While shooting, the extras were actually taking pictures of him with their phones.
Impressively, every 3-pointer shot Jesse Metcalfe made was real. No camera, editorial, or digital trickery was used.
In the script, the school didn't have a specific mascot, but while filming on location at an actual high school, the film adopted their mascot, the Kodiaks.