Not even close. The hit on Buechele was legal, and had no head contact.
The hit in the end zone is the very definition of targeting. The receiver wasn't in a position to defend himself, and he took a shot to the head. At the very least, it warranted a review. The officials couldn't even be bothered with that.
That being said, Kelly screwed up by not naming Kizer as the starter and eliminating the stupid rotation with him and Zaire, and VanGorder couldn't coach his way out of a wet paper bag. The only thing that led to them losing in OT as opposed to regulation was the chop block penalty on Texas. VanGorder's defenses have allowed 132 points in the last three games played - absolutely horrid.
ND should have went for 2 after they scored their TD in OT.