Only three scripts for the film "The Empire Strikes Back" has the famous revelation at the end, these scripts being Lucas's, the director's, and James Earl Jones's. The other scripts had Darth Vader telling Luke Obi-Wan killed his father. Before the scene was shot, Lucas pulled Mark Hamill (who played Luke, for all that don't know) and told him the truth. This was to get the most realistic reaction Hamill could get to information.
A similar effect was used in the second Pirates film. At the end of the movie, when Captain Barbossa walks down the stairs in Tia Dalma's shack (it never explained why a shack would have stairs...), the scripts all said that Anamaria would walk down the stairs. This was done for the same reason as before.
During an interview with Orson Welles shortly after his masterpiece Citizen Kane was released, the interviewer asked him "If no one was around to hear his last words, how does anyone know what they were?" After hearing this, Welles eyes widened and said, "Don't you dare tell anybody." Keep in mind that many movie criticsand fans alike consider Citizen Kane to be the best movie ever made.
For any LOST fans, I saw a DHARMA logo on the Cloverfield monster. Probably just an easter egg or my eyes playing tricks on me (admit it, that movie gets you dizzy), but still notable.
It was mentioned earlier that O.J. Simpson was the Terminator before Arnold Scwharzenegger took on the role. Before shooting began, Arnold tried and tried to get Cameron to cast him as his robot, but Cameron just wouldn't allow it. Arnold finally won over the director's support when he showed him a review of Conan the Barbarian, in which Arnold's acting is described as robotic.
One of the towers of Neptune's castle in The Little Mermaid is a phallic symbol.
The only line said in Mel Brooks's 1976 film Silent Movie was the word "no"... spoken by famous mime Marcel Marcaud.
During the Inquisition scene in History of the World, Pt. 1, another Brooks film, the nuns rising out of the pool with sparklers on their heads. Because the scene was shot in reverse, with the nuns being submerged, the sparks are flying into the sparkler, instead of away from it.