Ok, as for mystery 'falsettos':
No-Go Showboat (not the lead, but the "no gooo, no gooo")
Ballad of Ole' Betsy (around 0:48 on)
Who is this? I've asked before and it's never been officially settled. It sounds like it might be pitch-shifted or something. I also like the idea that it might be Mike. I'm pretty sure it's a male voice being weird as opposed to a girl's voice (i.e., it isn't Marilyn or someone like that).
Just reposting my query, which didn't get answered...