Read my story with Adam Brody, *ahem* I mean Seth Cohen here:
Dark Lord of the Seth: May "The O.C." Be With You
It's more about the fact that "The O.C." characters tend to quote Star Wars quite a bit, and the main character -- Seth -- is also an uber fanboy on the show. So that makes sense we'd be debuting the trailer to Revenge of the Sith this Thursday during their show.
The interview was with Seth in character (thanks to the show's creator and Star Wars fan Josh Schwartz). I had no idea that Captain Oats had such a Yoda quality to him. ;-)