Eminem was quite keen that the film not be an autobiographical piece as he felt that homing in on his own personal history would limit the storytelling and characterization. By creating a fictional character, he knew that he would be unrestricted in how he performed.
In the Rap Battle, Future calls Lotto and Lyckety-Splyt by their real-life rap aliases, "Ox" (Nashawn 'Ox' Breedlove) and "Strike", instead of their characters' names.
Jimmy Smith Jr: Fuck a beat, I'll go A Capella. Fuck a Papa Doc, fuck a clock, fuck a trailer, fuck everybody. Fuck y'all if you doubt me. I'm a piece of fuckin' white trash, I say it proudly. And fuck this battle, I don't want to win, I'm outtie. Here, tell these people something they don't know about me.
Rabbit was insulting his opponents' tough gangster attitudes, by showing them how they were all trying to act like 2Pac (Tupac Shakur). He continues to do so by calling Papa Doc "No Pac" as if he were the only one in the crew not able to act gangster. The line says: "You're Pac, he's Pac, no Pac, none" and with "None" he's referring that even if they have that attitude any of them are 2Pac and finally, Rabbit makes a cut-throat sign. After that, he begins to discredit credibility and raps about Pap Doc's real background (he attended Cranbrook, a private school); Papa Doc's background showed that his "gangster" attitude was just for the show.
Q
A Note Regarding Spoilers
A
The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. Spoiler tags have been used sparingly in order to make the page more readable.
Q
What does 'Uncle Tom' mean?
A
An "Uncle Tom" is a derogatory term for a black person who behaves in a subservient manner to white people. You may read more on the subject here.