Apparently while Thor: The Dark World was in production, Alan Taylor was having some script issues, so Joss Whedon was brought in to fix them. It seems like Whedon has become the go-to guy to help fix things for Marvel. His pen is truly mightier than the sword... or in this instance, Mjolnir. In a recent interview with SFX Magazine, Taylor talked about bringing Whedon in to help, saying,
"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. I can relate to guys who come out of the TV world, since that's where I come from. And being able to land and work and solve a problem quickly... I really was grateful."
How awesome is that!? Whedon was brought in to save the day, and up the quality level of the movie. I'm so glad that Marvel has Whedon help make their movies more awesome! He might just be the best thing to ever happen to Marvel. Hopefully they can hold on to him.