I've seen players called for hitting the QB low when they clearly were blocked into the QB. We've all seen all sorts of calls missed or mangled. I usually give the benefit of the doubt because it happens so fast in real time, but that PI call they missed earlier was so egregious it's hard to see how it could be missed (on LSU). That ACC crew was worse than the SEC crew IMHO, it just didn't impact the outcome.
I have to take is as "part of the game", like a pass that bounces off a receiver and is intercepted, or dropped. I recall one in an earlier game where the pass was bobbled, bounced of a player almost on the ground, and right into the hands of a large fellow for a Pick 6.