9. Quentin Tarantino was approached to direct, but he had to turn the job down because he was working on Kill Bill.
10. Eminem appears in every single scene of the movie!
11. Apparently, during filming, Eminem and Brittany Murphy became romantically involved.
12. There was supposed to be a sequel about a down-on-his-luck boxer trying to regain custody of his daughter. The project was scrapped, but then later became the movie Southpaw!