Some were under the impression their characters would have a greater importance in the film, while others were satisfied merely being an extra, even making a career out of it later on.
Almost each case is interesting in its own right, including Anthony Forrest, who played a character named Fixer, featured in a deleted scene as one of Luke’s best friends. The scene was cut from the film entirely, much to the disappointment of Forrest. However, he also had a helmeted role playing a sandtrooper who gives us one of the most iconic moments in the movie. So Forrest wound up in the film after all, but the bittersweet irony is, he was hidden under a mask.
Some weren’t aware of their diminished and virtually non-existent roles until they watched the premiere. Think about how excited you would be that you were playing the best friend of the main character in the biggest movie of all time, telling everyone you knew about your part, just to have all but two of your lines cut, and left with ten seconds of screen time.