I heard a theory on the school bus that it was really Boba Fett that was Luke's father. Since he was the best bounty hunter in the galaxy, he must have missed deliberately when he shot at Luke on Cloud City. It makes complete sense if you ignore all the facts.

I collected the ROTJ trading cards (with gum!) to get my fix of pics and spoilers during the wait. There was usually a few months between the US release and our local theatre showings. so there were spoilers galore. I totally knew those black blobs were ewoks.