Firefly is an awesome Sci Fi television series created by Joss Whedon. It’s funny, touching and full of great characters. Also, it’s made by nerds and so they put in little cookies here and there. One I spotted during the episode Trash was an SR-71 flying through the background while a shuttle was coming down to land.
What a wonderful thing.
Also in this episode Kayleigh has a model of Han Solo in carbonite next to her hammock in the engine bay.