13. J. J. Abrams had a WW2 style propaganda poster that said “Loose Lips Sink Starships” and he hung around the set of The Force Awakens when Kevin Smith visited. He also had Kevin Smith sign a non-disclosure agreement because he is known to be too talkative and open with the public.
14. Harrison Ford requested Lucas to kill his character, Han Solo after he gets frozen in carbonite. He didn’t sign for the next two movies in the original trilogy as he felt that the story of Han Solo was completely told in the first movie itself. But Lucas refused and told him that he still had a part to play in the next two movies.
15. In the Han Solo Trilogy set in Star Wars’ Expanded Universe, Chewbacca swears a life-debt to Han Solo who refuses to skin him for commandeering a ship full of Wookiee children meant for slavery. Han loses his commission and dishonorably discharged for not obeying orders.
The trilogy also features their adventures as smugglers after the incident and Han winning the Millennium Falcon in a card game with Lando.
16. Lucas’ life-long best friend Steven Spielberg was the first choice to direct Star Wars. However, Steven had to decline it because of his membership in the Director’s Guild. Lucas left the Guild because of his disagreement regarding Episode V – The Empire Strikes Back.
17. Michael Fassbender and Hugo Weaving were considered for the Role of Kylo Ren, but the role went to Adam Driver.
18. George Lucas was very influenced by Akira Kurosawa’s storytelling style through the point of view of minor characters. This inspired him to create the bickering interaction between R2-D2 and C3PO, which proved to become some of the most loved scenes.
Many similarities between Kurosawa’s The Hidden Fortress (1958) and Star Wars can be noticed. In Kurosawa’s movie a princess and general along with two bickering farmers try to fight their way through the enemies. The bickering farmers are the two droids, though according to Lucas the princess part was more of a coincidence. (source)