Visible crew/equipment: In the scene where Napoleon watches the farmer shoot the cow, the film crew and camera are visible in the reflection of the glass door of the passing school bus. (00:16:20)
Visible crew/equipment: When Deb is calling Napoleon from the pay-phone, you can see the reflection of the camera-men in the payphone number-pad, as pointed out in the director commentary section of the DVD.
Visible crew/equipment: Just after Rex slaps Kip in the face, the actors' white tape marker is visible on the floor.
Visible crew/equipment: When Napoleon throws an orange at Uncle Rico, the shot goes from the front of the truck to the side of the truck. In the little window, one can see a camera and a cameraman.
Visible crew/equipment: When Napoleon is walking up to Trisha's front porch, if you look in the door, you can see the reflection of a cameraman standing out by the street. (00:38:00)
Visible crew/equipment: When Napoleon is talking to Deb on the porch, as he says, "I made about infinity of those at scout camp," he looks off to the side a bit and you can see crewmembers and a reflector screen standing on the lawn, reflected in Napoleon's glasses.
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.