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Originally posted by: Pagz
Yoda hints at it, but at the time Leia was still not Luke's Sister. In fact, according to Gary Kurtz, Luke's sister was supposed to have been hidden somewhere outside the known galaxy. Leia being Luke's sister didn't arrive until the writing of Jedi.
Yes, and Darth Vader was not Anakin Skywalker as of ANH, and George Lucas basically wrote the stories on-the-go, with no overall plan or trilogy.
It's quite obvious to see, and documented in various interviews and articles, but this kin dof stuff is dangerous for Lucas Fanboys who desperately need to believe in an overall set of trilogies, conceived in 1977... otherwise, they've just wasted their lives following a pathological liar.