I've always heard this story, but yeah I'd like to see some contemporary examples of it, like, I dunno, a Starlog interview where Prowse talks about "I get to totally plow the rebels' shit in on Hoth, not even Green Cross Code Man could survive this ice planet smackdown" or whatever
Thinking about it for a minute, what exactly would he have been able to spoil beyond Maury Povich?
seems like toy catalogs and stuff still would have been listing "there is an AT-AT and it's a big walking thing" or "more bounty hunters" or whatever, although digging into some Sears catalogs might have some interesting info in that direction too