At just age nine, Ricky Schroder won the Golden Globe Award for "Best New Male Star of the Year in a Motion Picture" for his performance as T.J. Flynn in this film.
Publicity for this movie reported that Jon Voight shunned using a stunt double and did all of his boxing scenes himself.
Over two thousand children were interviewed for the key child role of T.J. Flynn.
Jon Voight was trained in boxing by Jimmy Gambina who had done the fight sequences for Rocky (1976). Gambina once described the big fight in this movie as "the best boxing sequence for a movie I have ever seen, better even than Rocky (1976)".
Jon Voight and Ricky Schroeder played father and son again in Return to Lonesome Dove (1993).