When Quincy gets in the car at the mini mart you can see exhaust coming out of the tale pipe he talks to Topo about going to a motel then he starts the engine.
Quebec's cars don't have front plate.
Chloe was told to look behind the car stereo for a package. When she finds the money in Billy's bedroom, it's a giant duffel bag that would NEVER have fit behind the car stereo.