George Lucas got so many nuances right in Star Wars . Little touches that said so much. One of the most overlooked is a moment that I vividly remember from first seeing it, on the big screen, as a kindergartener or thereabouts. It’s during the scene where Luke enters the Mos Eisley cantina. We still haven’t met Han Solo and Chewbacca. And while we’ve seen space ships and droids, stormtroopers and Darth Vader, Jawas and Tusken Raiders, every character we’ve seen in the flesh is a human. And then, boom, 45 minutes into the movie, we enter the cantina, and the joint is absolutely lousy with dozens of wild and wildly different aliens — including the band playing that iconic jaunty song. We suddenly learn just how diverse the galaxy really is. It’s one of the best and most memorable scenes in movie history. The moment I’m talking about is when Luke enters with C-3PO and R2-D2, and the frighteningly gruff bartender barks at him : BARTENDER We don't serve their kind here!…