There was an earlier version of the BtVS pilot, which was a bit less funny than the one that was finally aired, and more specifically had a completely different Willow (not a skinny redhead but a chubby blonde). I’ve never been able to find out why they first made that one, than apparently went on to reshoot the whole thing. Was it a pilot to get funding, then (a la Action, the short-lived series with Jay Mohr) rewritten on the behest of the producers?
Anyway, you could download an .MPG version on the 'Net a couple of years ago. The script was available as well somewhere. Fun for the fans, as a curiosity only.
This stuff does make me wonder about the economics of TV-producing. Is there a large pool for funding these pilots? Are hopeful writers/producers paying these pilots out of their own pockets in the hope of luring the big bucks of investors? Is it a method of producers to cut their losses, first creating a pilot and when finding out it doesn’t work, then pulling the plug before shooting the rest of the episodes?