Continuity mistake: Billy and Wendy pull over to the side of the road and Wendy turns the car off. As they sit in the car on the side of the road, exhaust can be seen coming out of the tailpipe. (00:15:55 - 00:18:45)
Goon, aka Rocky: What, you think I'm retarded or something?
Billy Brown: Yeah Goon, sometimes I really think you are.