I do remember that, on the Thursday night show, John Lydon seemed more than usually unhappy, crouching and staring out into the crowd who were dressed as punks and spitting on the stage. He called them all posers and looked disgusted by the lot of them. But on the Saturday all-ages show, with the kids just there to have a good time, John looked so much happier, even smiling, and saying how much more he was enjoying this show than the other one.
About The Young and The Useless, I remember Adam Horovitz on guitar with a ton of energy leading the band, and the singer, Dave, with the skinny mohawk, who seemed really, really young. I think they faced a tougher crowd on Thursday night, but got more applause from the kids on Saturday afternoon. They made enough of an impression that I went out and bought their record.