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2. David Prowse and George Lucas Don't Get Along

In 2010, David Prowse, the actor who physically played Vader, let it be known on his personal web site that he would not be attending Celebration V in Orlando because LucasFilm did not invite him. When he asked why he wasn't invited, he was told it was because he had "burnt too many bridges" over the years. Prowse has had a notoriously rocky relationship with Lucas. He resented his voice being overdubbed (without his knowledge) by James Earl Jones. And he further resented Lucas casting Sebastian Shaw to play the unmasked Anakin in Return of the Jedi. Some fans think Shaw was cast as the face of Anakin to spite Prowse for spoiling Vader's big "Who's Your Daddy?" reveal a full two years before Empire Strikes Back opened.