Continuity mistake: When Sean meets Twinkie, his glass is almost full to the brim. A shot later, it's half empty.
Continuity mistake: At the police station, a cop grabs Sean's T-shirt while he turns around to watch his mother step in. A shot later, the cop has vanished.
Continuity mistake: The size of the hole and the overall damage on Sean's car is much bigger when the ball hits the glass before the race than when the car crashes.
Continuity mistake: When the movie begins, Sean drives away while Clay stares, left arm bent upwards. A shot later, his arm is lowered.
Continuity mistake: The damage to the main protagonist's vehicle changes considerably during the race in the parking garage. See the right side for reference.
Answer: I believe he says 'find another driver'.
He says something before that. It sounds like he says "or gothica".