As well as Mike Tyson, several famous faces from the world of boxing make cameo appearances in this movie, former champion George Foreman, commentators Jim Lamply and Larry Merchant, and trainer Teddy Atlas.
Reunited Woody Harrelson with writer and director Ron Shelton after White Men Can't Jump (1992).
Incorrectly regarded as goofs: in the flashback, Vince Boudreau (Woody Harrelson) has a tattoo that says Grace on his back. Later during the fight, it says Peace. However, you can clearly see that he had Grace changed to read Peace. Most likely due to the fact he's not with Grace anymore.
The ring announcer in Cesar Dominguez's (Antonio Banderas') Garden flashback fight sequence is Bruce Buffer, brother of Michael Buffer, who is the ring announcer in the climax fight between Dominguez and Vince Boudreau (Woody Harrelson).