Little Bad Voodoo Brother - S4-E8
Revealing mistake: When Earl and Randy are being beaten by the mob, it is obvious that no contact is being made when Earl is kicked or when Randy is being beaten with sticks. (00:17:40)
Sweet Johnny - S4-E5
Revealing mistake: The air mattress embedded in the ground that cushions their fall, and the curly hair and face of the stuntman for Earl are quite obvious when Earl and Sweet Johnny hit the ground.
Continuity mistake: At the end when Stuart decided to let Earl go he pulls the list out of his pocket, and gives it back to Earl, and it is all crumpled up, but a second later when we see Earl holding the note it is neatly folded.
Police officer: It's police policy not to waste resources looking for a missing person in the first 24 hours because they usually show up on their own, and after 24 hours, if they're still missing, it usually means they're dead and we don't look for them that hard then either.
Trivia: At the end, Earl's father says that he talked to John Sheppard earlier that day. Earl's father is played by Beau Bridges who portrays General Hank Landry on Stargate SG-1. John Sheppard is the main character of Stargate: Atlantis, SG-1's sister show.
Answer: The premise of the show is he atones for mistakes he did in the past. Winning a car for Joy probably atones for something he did wrong regarding her in the past.
Rob245