When Champ is badly beaten up in the ring near the end of the movie, he is almost unconscious. To try to make sure he is okay, Jackie asks Champ, "What day is it today?" Champ says, "Thursday, May 23rd." The film takes place in 1979. May 23rd, 1979 was actually a Wednesday.
At the gym in the beginning of the film, Tex Cobb is being battered in a sparring match and his seconds call him Tommy. At the end of the film, Cobb is featured as Roland Bowers, Heavyweight Contender.