1. You may know that Eddie Murphy turned down an offer to possibly star in Ghostbusters before Hudson took it. What you may not know is that the original cast for Ghostbusters was Aykroyd, Eddie Murphy, John Candy and John Belushi. Murphy and Candy weren't interested and Belushi died before the project took off.
2. In Star Wars Episode I, Qui-Gon Jinn (Liam Neeson) repeatedly uses a communicator to contact Obi Wan and others. The communicator was nothing more than a lady razor
3. There are no Ferraris in Ferris Bueller, just painted MGs. It was too expensive to wreck and rent that particular model
4. During the making of Lord of the Rings, each actor who played a member of the Fellowship got a real tattoo that says Nine on them
5. In the infamous street market chase scene in Indiana Jones: Raiders of the Lost Ark, Indiana Jones meets a swordsman before shooting him. Originally, Indiana was suppose to engage in a long fight scene that resulted in Indy disarming the sword with his whip. The day they shot the scene, Harrison Ford was too ill to finish the scene and just whipped out his prop gun and shot him. The crew liked it so much that they used it in the film