Tudyk in mo-cap suit running around on the beach location. He even has the droid head on a stick for proper eye-contact and as a reference point for the CG artists.
Wow you’ve got a good eye! Seems like the movie is being done right! The CGI is so minimal but when it is there it seems to be done the best way possible. If the story/script sucks, at least we’ll have some great scenery to look at for two hours!