Rogue One director Gareth Edwards has revealed the slightly underwhelming way Scarif, the planet at the centre of the film's standout third act, got its name.

The British filmmaker was speaking at SXSW earlier this week when he reeled off an anecdote which saw his name spelled incorrectly on a cup in “a very well-known coffee shop” (while he fails to cite it, it's commonly known that this is a staple of any visit to Starbucks).

He explained how the name arose when he went for a coffee break intimidated by the pressure of naming the planet.

“Gary Whitta - a writer on the film - was naming things in the story, but eventually he was sick of doing it,” he said. “And I was waiting for him to say this. So he told me to name the planet at the end of the movie, the whole third act. I was like 'Right, this is a big deal. I’m going to get a coffee and I’ll come back with a name.' So I went to a very well-known coffee shop and was thinking and thinking what should it be.”

Rogue One: A Star Wars Story IMAX Featurette

He continued: “When the barista asked my name, I must’ve said 'It’s Gareth' and they heard 'Scareth,' because it was written on my coffee cup. So I went back and slid the coffee cup over and said, 'It’s Scareth.'

Rogue One final trailer: A shot-by-shot breakdown Show all 7 1 /7 Rogue One final trailer: A shot-by-shot breakdown Rogue One final trailer: A shot-by-shot breakdown Finally, Mads Mikkelsen's Galen Erso has turned up in a trailer; confirming previous hints that he'd be somehow responsible for the Death Star's construction. However, this new trailer reveals why daughter Jyn Erso (Felicity Jones) has become such a rebellious misfit; with Galen having been seized by the Empire when she was a young girl. Rogue One final trailer: A shot-by-shot breakdown Which, in turn, illuminates us as to why the Rebellion is so interested in Jyn in the first place; revealing that it's the Empire itself that first arrests her in the film, only to be freed by rebel Captain Cassian Andor (Diego Luna). Rogue One final trailer: A shot-by-shot breakdown This final trailer takes a surprising focus on Galen, who many previously thought would only appear in a minor role. It's interesting to see him here in some kind of Empire garb, which presumes that he may not be an entirely unwillingly prisoner in this situation. Is there a chance Jyn will recover her father, only to discover he's turned to the Dark side? There's definitely a sense in these trailers that Jyn will face some kind of moral struggle in her journey. Rogue One final trailer: A shot-by-shot breakdown "They are requesting a call sign." "It's, um, Rogue. Rogue One." OH, THAT'S WHY THEY CALL IT THAT. Rogue One final trailer: A shot-by-shot breakdown We've already seen Jyn in her TIE fighter pilot uniform, but this shot at least gives us a better idea of how she got to wearing it. "They've no idea we're coming," Jyn says; as she, Cassian, and K-2SO (an ex-Imperial droid reprogrammed by Cassian) infiltrate enemy territory. Rogue One final trailer: A shot-by-shot breakdown Looks like we'll be getting another big space battle. The question is - will this be the film's big finale action sequence? And is this the Death Star under construction? Obviously, we know the Death Star isn't entirely destroyed in the film; but this could somehow connect to the shot from the previous trailer of Jyn coming face-to-face with a TIE fighter. Rogue One final trailer: A shot-by-shot breakdown And, here's some more Darth Vader; now in epic striding mode. Looks like he'll be doing a lot of plotting with Ben Mendelsohn's Orson Krennic.

“It’s been so weird to see it on t-shirts and everything, but I couldn’t tell anyone that it was just a misspelling of my name of a coffee cup.”

So if you're reading this and you work in a Starbucks, you could well be the inspiration of a planet from a Star Wars film.

Edwards also reflected upon why the ending of his Star Wars prequel, starring Felicity Jones, Diego Luna and Ben Mendelsohn, changed during reshoots.