This question largely pertains to basketball and football (American - NFL). I've seen footage from the team locker rooms during halftime where the coaches and players go over issues from the first half that need to be addressed, key statistics, etc.
I've often wondered what the referees do during the half (other than get a breather). Do they go over replays where they botched calls? If so, do they have someone whose job it is to create the "highlight reel" of missed calls, e.g. a coach for the refs?
I understand this is a pretty open-ended question, but I'm looking for an answer beyond speculation.