Continuity mistake: When Rex slams the brakes on after hearing that Ian found a girl on the internet, the scenery on Rex's side slows right down to practically stationary. (Like it should since he slammed the brakes on). However out of Ian's window, the scenery is still moving at the same speed prior to Rex braking.
Continuity mistake: When Lance is sitting on the hood of the broken down GTO, he puts his glasses in a case and sets them on the hood. As Ezekiel pulls up, the view of Lance is from the side and you can see the glasses outside of the case on the hood.
Continuity mistake: In the bathroom scene where Ian and the men's room predator are waiting, once inside, Ian grabs for the toilet paper and you can see the predator's pants are on. Next shot you see the predator standing naked, and his pants are hanging up.
Deliberate mistake: When Seth Green and Lance pull up to Ian and Felicia, the car being pulled by the carriage should roll a little bit after the carriage stops moving, but instead it stops on a dime when it is only being pulled by rope, and nothing else to stop it with when the carriage stops.