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 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.
Continuity mistake: When Napoleon drops off the drawing of Trisha with her mom, he is standing on the porch. He then says 'bye' and runs off of the porch. The next camera shot is from Trisha's mom's perspective of the screen/glass door closing. When the door is closing you can see Napoleon's reflection in the glass (he's standing right there when he should have been far away from there if he had run off the porch as portrayed). (00:38:35)
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: 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.
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.
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.
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 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: When Kip goes to the bus station to meet LaFawnduh for the first time, you see LaFawhduh getting off the bus. But it is obvious that she is not the last person to be getting off the bus. As she's standing in the doorway of the vehicle, there is somebody standing directly behind her who's wearing a white shirt. The scene quickly changes to Kip & then back to LaFawnduh, but now there is no one standing behind her - and you are now able to see the bus driver seated there. (01:03:05)
Continuity mistake: When Napoleon asks Don for a "Vote for Summer" button, there is a boy in a checkered blue shirt that walks by Don and off the screen. Then when Don hands Napoleon the button, the same boy is back, but now he is walking by Napoleon. (00:58:15)