Oh, no, no, it's not about you, man. I'm not going all nerd on you about not realizing.
I don't want it to sound like that. I just wonder why Lucas and McCallum were so bloody secret in the press when the more geeky and nerdy fans who were familiar with the books and toys already knew that a corrupt and evil Sith named Palpatine was the guy who would go on to become the dreaded Emperor.
They weren't protecting any kind of state secret. It wasn't until Episode III was being readied for release six years later that George told Ian McDiarmid to go ahead and reveal to reporters that he was indeed both Palpatine and Darth Sidious in the movies. Ian would later go on to say "it'd be a very strange thing indeed if you hadn't known I played both characters and they were the same person, but there you go."
George had a lot of strange requests.