A shot is flipped when the group set out for Vegas to see Tony Vago (both the steering wheel and the car are on the "other" side).
Raymond's hair keeps changing between shots when he asks Addy to marry him.
When the cop is searching the RV's bathroom there is a close up of his pistol as he enters. The slide is locked back, like it is empty, making the gun useless.
When Raymond and Curtis run out of the motel room, just before the fugitives and hostages get into the hijacked blue sedan, the shadow of a boom mic is clearly visible on the parking lot pavement.