Audio problem: When Napoleon knocks on Trisha's door he knocks four times but you only hear three knocks. (00:38:05)
Audio problem: In the last scene before the credits, Napoleon and Deb are playing the ball game, and when they high-five each other at the end, it is out of sync.
Answer: Because it is such a small town that the school system can not afford buses for grade level so they have to share them, plus it has comedic value as well.
pross79
Small town schools are usually K-12. The other older "cooler" students drive to school or get ride with their friends.