Re. SBtB and the Fallon thing. First, SBtB.
It's a great show for what it was. I watched it throughout the early 00s before school on TBS. They had back to back epis at 6:00 and 6:30. It was cheesy, easy to watch, wholesome viewing for kids. The over the top absurdity coupled with the laugh tracks was a joy to watch. Admittedly, the show doesn't age well, but people who still like it and reference it, etc. do so because they watched a ton of the episodes over and over and over. At least that's why I do it. Bottom line, it was a good show for the demographic it served, and they replayed the hell out of it.
And the Fallon thing was pretty great too. I was ready to hate it, but they did a good job slipping about a billion references into a pretty short period.