At the very end (Texas was behind) Texas punted and tried to hold Cal, who on third and short broke a run all the way to the end zone but did that stupid back handed flip right before he crossed the goal line. Texas guy picked it up in the end zone but the replay refs ruled it was not an immediate recovery so still Cal's ball.
Replay refs also missed a pretty obvious incomplete pass that led to a Cal score earlier, but not that big of a deal.