Refs missed a holding call on the long TD pass that UNC had. Everyone at the game thought all the flags were for the holding call instead of the facemask penalty. A chant started from the students saying "you can't do that" It was a pretty blatant hold from my seats directly in front of the play. At the very least, should have been offsetting. That is only one play, but it was 7 points which was the difference in the game. UNC had the better athletes and played a great game. I was surprised Pitt held them in check in the second half. Good luck the rest of the season.
As someone who works 5 or 6 NCAA games (FCS school) each season from the sidelines, I get to see and interact with the game officials a lot. Holding can literally be called on 99% of all plays. Most officials will only call it if they think that it has an effect on the play's outcome or is so blatant that they have no other choice. The hold you mentioned on the long TD was away from the ball and probably would not have changed the outcome. The facemask on the other hand should have altered the play but because MW is such a stud was overcome.