Other mistake: Daric asks Ben to do "by tomorrow" a cheat sheet and get a 50 for it. Ben angrily crumples the sheet. At leas a day passes by, but there' a scene follows and Ben returns that same cheat sheet, neatly folded. He could have course have just copied it back on a pristine sheet, but he certainly didn't deliver it on the day he was asked to, but Daric makes no comment about it. (00:23:10)
Other mistake: The 4 kids just snuck into a party. Some jocks begin making fun of Ben, calling him "the chinese Jordan." Daric walking off to check on their puking friend bumps into one of them on purpose. During this sequence, notice that one of the guys is holding a paper cup completely empty just for show, and in the reverse shot it even flips suddenly. (00:37:25)