You know overall that game wasn’t poorly officiated IMO. For a pac12 game you barely noticed the refs really. A few obvious holds on a Gaskin contain and Browning check down but that is fine. Fox broadcast was way more annoying then the refs.
Why that final PI wasn’t called? I don’t know some say the JJ breakup was really PI that is good defense. Going through the body of the player is PI. In the final minute though I would say the PI needs to be egregious personal foul level stuff to be called usually. It is like fouls not being called in the final 10 seconds of a basketball game. It just isn’t whisteled.