5. The movie couldn't film at Shelter, the club that Eminem started rapping at, because it had become too nice of a club!
6. During the rap battle scenes, Eminem was suppose to just mime his words instead of talking, but after having a bunch of rappers challenge him, he finally started to rap back.
7. For his role, Eminem lost 24 pounds.
8. The group called 313 is a reference to the Detroit area code. However, the suburbs on the other side of 8 mile had an 810 area code, and people from that subdivision are often labelled as such.