First, the entire game would have been different if Michael Floyd's touchdown had been allowed. The South Bend Tribune's Marcus Marter got this photo of proof: (click any photo for bigger version)
The other big TD catch, one that was ruled a catch, was Golden Tate's fourth-quarter go-ahead grab. From our seats in the south end zone, we couldn't see this:
photo by Matt Cashore, the official University of Notre Dame photographer.
A better view is this:
photo by Rod Sanford of the Lansing State Journal. I love the "oh shit" look on the kid between the ref's head and Tate's hip.