Most of the game, normal officiating I thought. But the "push off", well technically it was, but should never have been called in the Super Bowl. Now the illegal block, you gotta wonder. Yah, he did go below the players knees, but it was for a tackle on the runner. That one was kind of a blown call.
I think the first one was the most costly though. Not the best officiating in a Super Bowl for sure. But .... the Steelers were never given a touchdown, they got them on some good plays. The Seahawks had one taken away, and their momentum as well.