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.

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7. For his role, Eminem lost 24 pounds.

Holy, that's a lot of weight for the already slim star!

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.