Star Wars: One of the most famous mistakes of the franchise occurs on the Death Star when Storm Troopers enter a room looking for Luke, Han and Chewbacca. If you look closely, the door to the room never opened enough and one Stormtrooper smacks his head. Unable to use CGI to edit the goof out, Lucas embraced the mistake by adding an audible ‘thunk’ in future releases of the film.

The Wizard of Oz: The villain of the classic movie meets her end by melting in water, but the actress who played her got it much worse. When the Wicked Witch of the West first exits from Munchkin Land, she does so in a puff of red smoke and a burst of fire. It’s memorable, but flawed. Not only can the trap door releasing the smoke be seen opening from the set’s floor, but it begins to pour out before the witch even begins her mark. So why was it left in the movie? In a later take, actress Margaret Hamilton was severely burned when the fire erupted early, taking her out of action for almost 2 months. When she returned, she refused any more fire stunts.