I just now found out (through the radio drama) that during the Cell Block escape Han shouts "He's the brains, sweetheart!" to Leia. I always thought he said, "Peas for brains, sweetheart!"

I also never understood what Veers or whoever said to Vader during the first AT-AT scene on Hoth. He says something to the effect of "You may start your landing." but with his strong British clip- I thought he said, "You may start your napping." That didn't make any sense... but that's what I always heard.

I'll tell you about OTHER people's misconceptions. When Jabba says that Han will become "Ban-tha poo-doo" and the subtitles say "bantha fodder"... this has caused many of the "Star Wars generation" to think that the English word "fodder" means "poop" rather than "food". It sure doesn't help that the prequels turned it into a mild oath "Poodoo!" where a literal translation into "fodder" doesn't make much sense. Maybe batha's eat their own poop. That would solve this little conundrum.