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)
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)
Audio problem: When Napoleon knocks on Trisha's door he knocks four times but you only hear three knocks. (00:38:05)
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.
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: 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.