I went through the special features again on my own, and I finally found the quote you're talking about, greencapt. It's in the "Future History: The Story of Earth That Was" documentary. It has Joss talking about how he read this book about the Civil War... "and it made me think of the Millenium Falcon... because a lot of things make me think of the Millenium Falcon." And then it cuts away to a shot on set while filming, and, for reasons I can't quite figure out, one of the crew shouts to an area offscreen and says, "You think we should send a picture of that to George Lucas?" and people laugh.