I apologize if this has been brought up already, but here's a couple of small Bespin details:
There's the entrance to Vader's dining room:
Initially it looks like this:
http://picasaweb.google.com/lh/photo/_tsIB7CA5_cLvQ9w835k2A?feat=directlink
But then it looks like this:
http://picasaweb.google.com/lh/photo/eKswGdY4S1wsoJ282rSUyg?feat=directlink
And the space behind Vader changes as well, first like this:
http://picasaweb.google.com/lh/photo/wbCC0RvVUVRRz5VuvX2I_Q?feat=directlink
Then a building sprouts up in there:
http://picasaweb.google.com/lh/photo/an9P3OFnx5gKXWvjiwOrag?feat=directlink
EDIT: Added links to images
EDIT: Pictures removed. Bingowings