I just noticed on the replay of the end of that game that there were two lead officials for a short time. Right when Bucknell comes up with a loose ball with a few seconds left under KU's basket and KU is called for a foul, ends up being 2.4 on the clock. At the beginning of that replay you see at the top of the screen Lead #2 realize that he's supposed to be C and casually move back onto the court.