Audio problem: During any fight when people are yelling "Mo cuishle", watch the spectators around and you'll notice that no one is mouthing the words, or is in sync with those words. Even if the yelling came from offscreen (i.e. from the farthest bleachers) the noise should have sounded from far away, not as neat and close as it sounds.
Trivia: In the film, Lucia Rijker who played Billie "The Blue Bear" fights Hilary Swank for the first million dollar fight in woman's boxing. Lucia Rijker is scheduled at present to fight rival Christy Martin, with the winner to be the first female boxer to win a million dollars in boxing history.