The infamous asteroid scene in The Empire Strikes Back film actually contains some rather odd objects. Two of the asteroids used for the film were actually a potato and a shoe.
Alec Guinness who played Obi-Wan Kenobi thought the Star Wars films were going to be complete fairy-tale rubbish. Because of this, he managed to get 2% of the gross box office receipts for the movies he worked on. This deal landed him over $90 million.
Originally, Lucas wanted to use stock footage and CGI to bring Peter Cushing’s character, Tarkin, back into the Star Wars franchise during Revenge of the Sith. However, the footage used was poorly executed thus Lucas had to drop the character from the script.
Ewan McGregor really enjoyed lightsaber battles as every time he had to act out a battle scene he would make lightsaber sounds with his mouth. This caused each battle scene to be fixed in post-production.