Sat in front of a parent of a player who said that our center has no idea (I think he was exaggerating a bit) what line protections to call against stems and stunts and that this was also a problem last year with Mason Cole. He said Michigan does too much big on big blocking and not enough combo and slide protections. I'm not an OL so I have no idea what this means. Probably not breaking news, but it was a confirmation of sorts that this might be a systemic problem.
The second tidbit I picked up was actually from a Wisconsin fan at dinner after the game at The Old Fashioned (great burgers if you ever make it to Madison). We got to talking about the game and the subject of some of those brutal calls (and no calls) came up. He said don't expect it to get better for Michigan. I asked why. He claimed he went to college with someone "high up" in the B1G office who deals with officials and that he's made several off handed comments to him about "sticking it" to Harbaugh and Michigan. The guy was laughing while he was telling me this like it was an open secret or something. I was going to press for more info but my friends were more interested in getting his takes on what bars to go afterwards. Like always take it fwiw.
EDIT: Can't be certain but after some digging I think this may be the guy he was referring to https://en.wikipedia.org/wiki/Bill_Carollo