I was (am?) almost positive the commonality was shows containing Purple Rain. The second two jams both fit the bill. I've searched high and low for the first clip but can't seem to find it. I even checked 12-31-98, which has 1999. It sounds to me like it is from 98-00 era, but Deer Creek 99 is the only show during that time period with Purple Rain, and I'm almost positive the clip is not from that show.

I'm starting to think I'm missing something with the commonality. Can't figure out how the Lidocaine ties in.