Continuity mistake: When Napoleon is waiting while Rico makes a sale, he checks his watch to see how much time he has before the dance. The first time he checks it, the date on the watch indicates Thursday July 17. When he checks it again a few minutes later, it shows Monday July 21.
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.
Continuity mistake: When Napoleon starts his dance skit near the end of the movie, his t-shirt is tucked into his pants. Shortly into the skit, the shirt comes loose in the back and on one side. A few seconds later, the shirt is once again completely tucked in. This happens several times throughout the scene. (01:21:30)
Continuity mistake: Kip puts a green bowl under the wheel of his truck, but the next second it's a blue bowl. (00:37:45)
Continuity mistake: Toward the end, when Napoleon is standing outside his house yelling at Rico to "get off my property", the front door of his house, behind him, keeps changing from nearly closed to wide open and back, between shots.
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 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)
Continuity mistake: In the opening scene, when Napoleon first gets on the bus, he puts his hand on the seat in front of the seat that he's going to sit in, right by a kid's head, but in the next shot, the kid is gone. (00:04:15)
Continuity mistake: After Pedro puts the cake down it moves closer to Summer's door and slides across her doorstep. The envelope under it also disappears and reappears. (00:26:35)
Continuity mistake: When Napoleon throws the fruit on Uncle Rico's van, it hits the windshield and leaves only splatters of juice on the windshield, but when Rico stops the van, the windshield has several chunks of the fruit on it.
Continuity mistake: When Pedro is sitting at the table in the cafeteria, Napoleon comes to sit down, and Pedros's arm changes position from shot to shot. (00:34:10 - 00:34:40)
Chosen answer: This is never explained or referenced.