I was watching TESB this afternoon, and I noticed something I've never seen before. On Bespin, when Chewie is trying to retrieve C-3PO from the Ugnaughts, look to the right of the screen. There is a droid, a "Zuckuss" just sitting there. He's more silver/chrome than the brown one from the Star Destroyer, but it looks JUST like him. I had always thought that 4-LOM was a droid and that Zuckuss was organic with some mechanical apparatus for breathing, but it is apparent that Zuckuss is also a model of droid.