LSU - poorly coached.
Coach calls last time out in regulation with a lot of time left to sub in a FT shooter, who missed 1 of 2 anyway.
For final shot they have no TO and player doesn't comprehend the clock.
In OT - same thing. Calls last TO with too much time left. Get a decent look coming out of the TO, but have no TO for final shot one play later for them.
LSU guard in OT drives to the rim w/10 seconds left early in shot clock - gives K way too much time to come back up court and score, which they did.
The foul on Harrison was iffy, but the defender's arms weren't perfectly straight and he was moving - not a great call, but by no means an outrageously bad call.
LSU beat themselves. Too bad, but that's what happened.