- Cast the Expert: Maggie's opponent in her final match was played by Lucia Rijker, a champion female boxer in Real Life.
- Dueling Movies:
- With regards to theme: Cinderella Man, a more conventional Oscar Bait boxing flick that came out the following year, but ran out of buzz long before the awards season rolled round.
- It was something of an upstart at the Oscars, as everyone was expecting The Aviator to be Martin Scorsese's long-awaited triumph. MDB strolled in without an ounce of hype and walked away with best picture and best director.
- Dyeing for Your Art
- Fake Irish: Averted in case of Frankie Dunn: the actor does have Irish ancestry. Hilary Swank, not so much, but her character doesn't have any connection to Ireland besides the last name Fitzgerald.
- Playing Against Type: Jay Baruchel, a Canadian Jew known for playing nerds, playing a mentally-disabled redneck.
Trivia / Million Dollar Baby