yep, there are 2 versions. a slow and a faster one with more intstrumental backing. the seciond version, from the album of the same name, is more upbeat and has a bit of a late 60s psychedlic feel to it.
there is a lot of unreleased songs. they are listed here:
http://www.lightfoot.ca/unreleas.htm
the warner demos are circulating, and there are live versions on bootlegs of some of the others that are unreleased (pleasures of the night, 2 crazy kids, divorce country style and rock my world to sleep.
I'm not sure of very early demos, but there is the Early Ligthfoot album and Two Tones Live At the Village Corner