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.
Continuity mistake: When Napoleon is asking Pedro if he is going to eat his tater tots the position of the tots keep changing between shots.
Continuity mistake: When the bully beats up the nerd with the turtleneck and puts him into a headlock, notice the disabled girl in the red shirt that walks by them. She walks past them twice in about 6 seconds.
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: 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.
Continuity mistake: When Napoleon asks Deb for a keychain, a piece of paper is seen on the ground to Napoleon's left. Then after Deb gives it to him and runs off, the paper is behind Napoleon.
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.
Continuity mistake: When Napoleon is feeding Tina, he stretches his arm over the fence and there is a rope visible. The rope repeatedly goes from being closer to further away from Napoleon's arm.
Other mistake: While asking Napoleon to pull him into town, Kip is putting on his roller blades. They live on a gravel road seen in other shots which would be impossible to rollerblade on while being towed behind a bike.
Continuity mistake: When Summer and Trisha are handing out "vote for Summer" fliers, in the close up of Summer handing them out you can see that one of the girls has on pink nail polish. Moments later, in a shot from a further distance (yet close enough to see nails), neither girl has on any pink nail polish.
Continuity mistake: When Uncle Rico is eating steak in the kitchen, the roll of paper towels changes before he takes one for a napkin.
Continuity mistake: When Uncle Rico hands Trisha and Summer the "Bust Must" fliers, at the end when they show a close up of them reading it, there are two sets of hands holding up the paper. However, in the shots both before and after, Trisha is only holding up the flier with her right hand.
Continuity mistake: When Napoleon, Grandma, and Kip are all in the kitchen area, in the shot of Grandma leaving, the container is nowhere close to the counter top edge and next to what looks like a phone book. Two shots later, in a close-up of Kip, the same food is now close to the counter top edge with the phone book nowhere to be seen. As the two argue in different shots, the container of food moves back and forth. On top of this, the phone book that was there in the original shot has mysteriously disappeared from every subsequent camera angle.
Continuity mistake: When Rico stops at the farmhouse while taking Napoleon to get his prom date, watch the passenger-side outside mirror on the van. While driving, it is positioned at a normal angle to see straight back from the driver's vantage point. When Rico gets out at the farmhouse, the mirror has been turned substantially and now sticks straight out.
Continuity mistake: Tina is not tied up to the fence, when Napolean first begins feeding her.
Continuity mistake: In the scene where Napoleon tells Uncle Rico to leave, Uncle Rico is throwing footballs in front of the video camera. There are three footballs; two on the ground and one in his hand, yet he throws four.
Continuity mistake: When Uncle Rico tells Napoleon about the sale in Bemida the jar/ glass of milk was not lifted up before the shot of Rico putting it down. It doesn't seem like he had picked up the jar before then because we can see it in Napoleon's shots.
Continuity mistake: When Napoleon calls Kip from school, you see that he was grating cheese for nachos. When the view goes to Napoleon and back, you see that the position of the block of cheese and amount of cheese on the chips changes. This happens multiple times throughout the scene.
Continuity mistake: During the opening scene on the school bus, they drive past a neighbor's barn as soon as they pull away from Napoleon's house. There was no gap in time because the dialogue is continuous, yet later when Napoleon walks out his front door to feed Tina, the closest neighbor in that direction is far off in the distance.
Chosen answer: This is never explained or referenced.