This is not 100% for this thread, but it ties into ESB enough I figure. The scene of Luke in the cave on Dagobah was always one of those things that I thought we'd see more of in the PT. When Luke goes down there we start to see that theres a structure, a hallway of sorts, and I always liked to think that it was so imbued with dark vibes due to some long past Sith business or some such......perhaps one sith lord betrayed and killed another here in this same spot, and it has always retained some of that negative energy. Yoda could even have picked the planet on purpose, thinking to use the area to train new Jedi.....anyways, just a thought, and another way the PT could have been cooler.