Could not argue too much about calls on us, though at least one PI was iffy, and I don't think the targeting was correct, as you can see from replay he clearly lead with his shoulder, even getting his shoulder under the Iowa player's armpit. Can't very well detach a players head so that no helmet-to-helmet occurs at any time.
And yes, we did enough to lose this game in combination with some one-sided officiating. That said, Iowa's last & go-ahead, game-winning TD was the result of a few missed calls on Iowa. Two/three of the most egregious were the 4th & 1 play they ran late in the 3rd Q (blatant hold and even facemask on Gerri Green by Iowa #77)and the following TD pass that should have been called for offensive PI (WR blocking downfield prior to a pass thrown beyond the LOS) & holding on the WR blocking Abram.
On the 4th & 1 play in particular, Gerri was in position to stuff their QB 2-3 yards short of the 1st down. Only reason he didn't make the play is he was grabbed by #77, pulled down, and then #77 grabbed Gerri by the facemask and pulled him away from the QB who was headed straight for Gerri.
Worst case scenario for us should have been them attempting a FG, perhaps taking a 20-19 lead, then us getting the ball again. Given they won by 5 points, I'd say that was a big-time-game-changer-of-a-blown-call. And it was right out in the open where the refs couldn't miss it.