Even if Lord of the Rings was only released recently, the author had previously refused several requests for permission to adapt his work, notably one from the Beatles. John Lennon would have played Gollum, Paul McCartney starring as Frodon, Ringo Starr as Sagace, and lastly Gandalf by George Harrison.
Mark Hamill is known worldwide for his role of Luke Skywalker, the central protagonist of the original film trilogy of the Star Wars universe. What is not common knowledge, however, is that he has turned to dubbing, starring as the voice of a superhero in movies and video games. He is notably the voice of the Joker in the Batman movie.
Avatar, the last movie of James Cameron, was ready on paper since 1995 and production would begin in 1998, after the blockbuster Titanic. The American director held off on the project as he felt the current technology would not do justice to the special effects of the film.
In the film Erin Brockovich by Steven Soderbergh, the real Erin Brockovich plays a waitress in the scene where Julia Roberts, who personifies Erin Brockovich, is going out to dinner with her children. Erin wears a badge with the name Julia, to underline the fact that Julia Roberts plays her character.