Continuity mistake: Mark Wahlberg's fight statistics shown before final fight are the same as those shown for the previous fight - wins statistic is 20 for both. it should be 21 for the final fight as it was his victory in the previous fight which qualified him for the final fight/championship match.
Factual error: In the scene where "High on Crack Street" premieres, the modern logo for HBO Documentary Films on screen. The original special did not have any opening logos and simply said Home Box Office Presents.
Factual error: In the scene where Micky and Dicky are jogging down the street, you can see in the background a brand new Toyota pick-up truck that was not available in the 1980s.
Factual error: Going into the fight with Shea Neary (the last on in the movie), the television broadcasts that Ward's record is 20-7. In reality, Ward's record going into that fight was 34-9.