I thought the first one was offensive interference...and pretty obvious. However the last play the bama defender was actually picked by his own team mate who grabbed and held the Clemson receiver.
It was a good no call imo. At worse Clemson would have kicked the FG and taken it into OT. Bama did not beat them. If you are a true champion you do not allow your opponent to drive 80 yards in the last 2 minutes with the game on the line.
Clemson won the game fair and square.