Sofia Coppola forgot she was in The Phantom Menace
As everyone knows, Sofia Coppola played Saché Adova in Star Wars: Episode I

Ahead of the release of her new movie, Priscilla, Sofia Coppola has made a grievous admission. Speaking to Rolling Stone in a career-spanning interview, Coppola admitted that she forgot she was in Star Wars: Episode 1—The Phantom Menace. We’re not kidding. Coppola did not remember playing Saché Adova, one of Queen Amidala’s handmaidens on Naboo, not to be confused with Sabé, who is played by Kiera Knightly. What is she, chopped liver? Saché was once considered a favored successor to Sio Bibble!
When asked by Rolling Stone about her small part in the film, she responds by laughing—laughing—and says, “I forgot about that.” Saché, a war hero who engaged in covert ops against the Galactic Empire and refused to name names when facing interrogation before being elected to the planetary legislative assembly (per Wookiepedia, obviously—why the hell would anyone know that sort of thing off the dome), has no lines in the film. Nevertheless, Coppola used the opportunity on set to learn about filmmaking to write her debut The Virgin Suicides.
“When I heard he was doing a Star Wars movie, since I was so little the first time, I said, ‘I want to come hang out.’ So they said I could be in it, and that was the best way to be on set,” she said. “That was such a funny experience — I was actually writing the script for Virgin Suicides while I was doing it!”
Though she insists, “I love George like an uncle,” and claims to “share a birthday with him,” she clearly didn’t use his knowledge for the role, which probably consisted of him pointing at her and saying, “Uh, yeah, you’re Saché, um, Adova.” Still, she proudly uses Lucas to influence her own film Somewhere.