In the UnRated DVD version of the film the scene where young Ricky steals his mother's station wagon (as seen in the theatrical version) is missing.
The "Unrated and Uncut!" DVD version of the film is missing the scene where Ricky recruits his former pit crew from a car wash.
In the theatre version of the film, when Ricky goes to Jean's house, he is introduced to Elvis Costello and Mos Def (as Jean's brother-in-law), but in other versions, Ricky is not introduced and when he asks if it is really them, Jean simply says, "No".
In the meantime a detailed comparison between the theatrical version and the unrated version with pictures has been created and you can find it here.