James Corden is an oddly controversial public figure: an entertainer who seeks only to bring joy to the world. But sometimes he goes too far. (Then again, sometimes he gets texts from Tom Cruise about landing a helicopter in his yard.) An example of this happened recently, when he and three cast members from the forthcoming musical movie take on Cinderella — in which he plays one of the mice turned into a footman — ran into a Los Angeles street, all for a flash mob stunt meant to advertise the film. But for some, the move did the opposite of delight.