Aside from the bad officiating, which hurt both teams at different times, this game mostly looks like Michigan State did their homework and figured out a few things.
They kept a safety deep in center field for that play-action bomb we've been hitting on. Picked it off, on a play that would have been the game-winning touchdown if Haarberg had just thrown it to his receiver. Re-watching that play, Bullock fakes to the center of the field and then cuts back, creating some really good separation. Just as he fakes, Haarberg throws - to the center of the field. He bit on the WR's fake.
Hutmacher was not double-teamed the entire game. He was pretty much contained by their Center one-on-one. Robinson wasn't wreaking havoc like he has the last three games, either. The entire front seven seemed uninspired. For a defense going up against a banged-up O Line, we should have had a lot more pressure on their QB. I don't know if Polar Bear and Robinson are slowed by injuries, but they have drastically dropped in production the last two games.