Freakonomics just did a great bit on the true source of home-field advantage (http://www.freakonomics.com/2011/12/18/football-freakonomics-how-advantageous-is-home-field-advantage-and-why/)
To make a long story short -- the biggest source of variation (home vs. away team) comes from refs who are influenced by the crowd noise. The louder the stadium, the more the bias. This made me think back to a bunch of no-calls at the end of the Iowa game, it seems like Kinnick's advantage may have been that the refs didn't want to upset a screaming crowd that is almost right on top of them (I've heard that the seats are closer to the field than in most stadiums)


Of why the blue hairs can suck it.