This new Showtime documentary looks at what it claims is one of the most significant college football game in the history of the sport: a game in which Alabama coach Bear Bryant, in hopes of ending segregation at his school program, invited the University of Southern California, with its strong complement of African-American players, to play a game in his home-field Southern stadium. The shame is that this was in 1970, shockingly recent in civil-rights terms. The glory is how the players and coaches conducted themselves, and made a very emphatic, instantly influential point.