When Brittany's brother hacks Jordan's cell phone, the cell phone is off.
At the start of the bike chase, Brittany does not put on a helmet, but she's wearing one in the next shots.
A "Senior Countdown" banner can be seen in the school courtyard. Why would a middle school have a "Senior Countdown" banner?
The first time Jordan's assistant/best friend calls Jordan's phone, the number appears along with "Brittany Aarons". Names only appear when called if they're contacts programmed into the phone.
When the mom takes away Brittany's big bowl of ice cream and hands it to the dad, the whipped cream tilts sideways revealing the cardboard it's resting on.
Towards the end of the movie when Jordan sings and plays his guitar, you can see that his hands are not strumming the guitar strings.
The girls' gym shirts indicate that their school is in Pennsylvania, but palm trees are growing on their suburban lawns.
When Len and Eddie pull into the park, thinking they have found Jordan, the boom mic is visible on the hood of the minivan.
When they spot the bike in the park by the pipe and stop to get out, the boom mic is reflected in the hood of the minivan.