That was a great read.
One blogger who travels around Montana, catches some of these games.
http://www.dailymontana.com/search/label/football" onclick="window.open(this.href);return false;
He mentions "The Slaughter Rule,"
"A number of filmmakers and journalists have given some attention to the topic of high school sports in small-town Montana, most notably the makers of the basketball documentary, Class C: The Only Game in Town. The Slaughter Rule uses as its backdrop the six-man high-school football teams in the Golden Triangle country north of Great Falls. The scenes are evocative and lonely, particularly those of a wintry game filmed up in Heart Butte.
"The film is a fictional drama, though, and is less a study of football than it is of isolation and uncertainty, as its characters struggle to find their places in life. It's one of the most depressing and troubling films you'll ever see, but there's great cinematography and a fair amount of Montana insight. Another movie that's worthwhile, but definitely not for everyone."
There is a blog devoted to small town Montana football.
http://six-eight-eleven.blogspot.com/" onclick="window.open(this.href);return false;