Harrison Ford with a ride
The idea that George Lucas had 12 films all mapped out before the first Star Wars was released is simply a myth, even though it has grown over the years with fans and media. The fact is that Lucas wrote a great deal of material when he was developing his little sci-fi adventure, but didn’t have it all figured out.
Stayin’ cool on Tatooine
Jedi was going to be named Revenge of the Jedi until Lucas decided that Jedis actually do not seek revenge and changed the title. This was almost at the end of the production process so there was a lot of promotional gear with the title already printed that had to go to waste.