 As the rap battle scenes took days to film, and the 300 extras were  starting to get bored, Curtis Hanson (I) (qv) initiated an improv  freestyle rap battle among them, where the three best rappers would  be filmed going head to head with Eminem (qv). 134 volunteers  signed up, each getting 15 seconds in front of the judiciary panel  to make an impression. This was then whittled down to 20. Ultimately  the jury couldnt decide on just three and chose four instead, all  of whom had a one