Saturday's Heroes was a 1951 movie about the hypocrisy of student athletes being asked to maintain the façade of amateurism while the schools profit off of their efforts. There were many football scenes in the movie, so they employed a small army of extras to recreate game play, all uncredited. This photo is a group shot of uncredited extras, which is why you have players in two sets of uniforms, plus referees, as well as some seemingly random people in what would otherwise appear to be a team photo. Musso is easily recognizable standing center left in the number 67. Two columns over, one row to the back just behind a referee is Dutch Hendrian who played an assistant coach (also uncredited). While Musso does not appear on IMDB's cast list, the list does not have the "verified complete" note on it., and all of the other football related movies Hendrian appeared in do.