Continuity mistake: The car that the kids cut up to make a convertible is different from the model used later in the movie.
Continuity mistake: Right at the start of the movie, when the ramp locals are testing out the new ramp, the sky changes from clear blue sky to overcast.
Audio problem: When the Daggers get off the bus after chasing the main character a disembodied voice says, "I know where there ramp is." No one on screen is talking and the voice sounds nothing like any of the characters.
Visible crew/equipment: At the start of the movie, when the ramp locals are testing out the new ramp, you can see a boom at the top of the screen.