Hmmm were people saying Billy is from that era because of Billy The Kid? I guess I never made that connection. With lyrics like

"Billy, Billy
Ain't love hard to explain?
For a debutante you're a real hard woman
But I love you just the same"

the rationale would have to be a name like Billy is fresh in Jon's head I guess? The list looks dead on though. The band says Ordinary People was These Days but that's wrong wrong wrong. Written during that era perhaps but the version(s) we have are late 90's all the way.