Kurt, don't sweat it. Kennys brother-in-law had a similar experience last year at PittRace. Was out in N, they were red flagged, as he came off track he saw riders lined up at the grid and headed that way thinking they were N group going back out. As he got there they were releasing bikes, and he just followed them out. He said that when he was being passed by freight trains before T2 he knew something was terribly wrong, and immediately threw his arm up and stayed on the edge of the track all the way back around to Pit in. Your excursion was accidental and you handled it right. No problem.
Darrin is right. The early A sessions at Main were kind of relatively slow. The pace picked up through the day - and it'll only get faster. Those of you in N and I could really gain some insight by picking a strategic spot at a track and watching the A group. You'll start to better understand why we REALLY focus on lines and body position.
On Sun and Mon there were some folks that were stretching - if not outright breaking - the rules in N and I. N in particular. Frankly, more than one of them would have been bumped to I had they been playing well with others. We talked to everyone we could and really tried to keep things under control
That being said, I also want to emphasize that you guys should be riding your own laps. Don't let others distract you, and get used to things going on around you. When we're running A sessions, it is REALLY REALLY common to have three bikes all within a foot of each other through the entire lap. Passes get tight, and they get aggressive. You shouldn't be dealing with that in N, but it's also helpful to be aware that as you progress, you're going to need to get more comfortable with things happening in close proximity to you. You need to be looking AHEAD - giving you time to anticipate things happening and reducing the unexpected. And please don't be turning around and looking behind you. Had to talk to a few people on Sunday who kept turning around for some crazy reason. Believe me, they had enough in front of them to worry about. What was behind them was - well, behind them. Not their problem. I saw one guy turn around at Shenny 17 times in a single lap.