You ask a lot of good questions.
When does control end? I guess when we leave the field, although I've never had to report any post-game shenanigans. I've stayed on the field a couple of times to make sure nothing started. I've also got out of there a few times when that seemed like the better course of action.
There have been a few incidents with people after games, but nothing that amounted to anything. The usual insults and uninformed accusations. I don't worry about it because I know these people have never in their life had the guts to even try to officiate.
Consider, last year I went to a state final where a crew from my association was calling the game. It was a great game and the crew did a really good job. They had it buttoned down, really controlled the game but kept it moving and kept it clean. I don't remember any controversy at all. The evaluations were highest marks. That said, as I was walking out of the stadium I was walking around some fans of the losing team -- elderly ladies, mostly, but some men and women who might not have their AARP cards yet. They were all talking about how to call the state to complain about the racist officiating. Who could they call to complain about how bad, how one-sided the officiating was. How was it fair that these prejudiced refs were on their game?
If it's possible to sprain your eyeballs from rolling them so hard, then I probably did it.
Regarding calls, I've had a few clunkers over the years. I've had calls I've reflected on and knew it wasn't a quality call. I've missed calls that I thought about a little later and wished I had called. That happens to all officials. One thing I NEVER do is act like I'm right when I know I'm not. Many years ago, working line judge, I saw a pass defensive pass interference that I was getting ready to flag when the ball went over the heads of the receiver and defender and a deep safety laid out and caught just above the grass. I was so struck by the amazing catch that I went to that spot and signaled that it was a catch and turnover. That's when I realized it shoulf have been a DPI and I had not flagged it. Whether or not it was too late at that point is up for debate, but at the time I thought it was too late. The head coach was livid. He asked about the DPI. Why hadnt I flagged it. What could I say? I just said "Coach, I'm not going to tell you that you're wrong,"
I also had a play when working line judge where I saw a receiver run back toward the defensive end. I just knew he was going to crack back (a block in the back) and I had my flag ready. When the receiver (#2) got there, he bascially stopped and set a pick. He barely touched the DE, but I was ready and I flagged.it. Being much younger at the time, I just went with it but it bothered me. As luck would have it, I ran into the head coach that week and I told him "When you looked at that film you saw me flag #2 for a block in the back. That was a terrible call and I want you to know that I realize that. I anticipated it and I was wrong. Should never have flagged it or let the penalty be enforced."
Only once do I think that I made a call that might have cost a team a game, but I don't know if I did or not. And the two officials that had a better look than I did are both dead now so I can't ask them.
Good questions. I'm always up for answering questions.