"Joss came in to save our lives a couple of times," laughs the director. "We had a major scene that was not working on the page at all in London, and he basically got airlifted in, like a SWAT team or something. He came down, rewrote the scene, and before he got back to his plane I sort of grabbed him and said, ‘And this scene and this scene?’ And he rewrote two other scenes that I thought had problems. Then finally we let go of him, he took off again, and we shot the scenes; and they were just much better and much lighter on their feet. Much more fun, much more surprising than what we had been trying to do.