There should have been an after the play penalty on the on-side kick. The Saints bench was on the field interfering, including multiple coaches while the refs were looking for the ball.
While I don't think this non-call made any difference overall as it would have only given the Saints a different starting point, it should have been called in my opinion.
I thought the same thing, as player after player came out onto the field to get involved...
But, I also agree with your second point... the way the Saints marched down the field, did it *really* make a difference that there wasn't a penalty? They're on such a high at that point, I don't think a few extra yards would have made a difference.
If I'm the person responsible for grading the officials, there are definitely flaws that I could find... but I really thought that they called it the same for both sides, so despite the fact that I don't personally care for the way they called the game, the playing field was, IMO, level (well, actually, it's slightly crowned, but... you know what I mean.
), and as a spectator, having the game called "fair" is more important that whether it's called "tight" or "loose".