The shot itself is the third stage of the screwjob. UCLA should have been called for a foul when they hacked the guy receiving the inbounds pass, but they weren't. And then the refs gave UCLA the ball when it went out of bounds, even though it certainly appeared to go off a UCLA player.
Cal should have gotten free throws. But barring that, they should have at least gotten the ball. They got neither. That the winning shot might not even have been legal is just the icing on the
cake.