(This is all supposition on my part- I have no proof, but I'm taking a stab in the dark...)
I heard an interesting analogy on the commentary track for the movie "The Big Hit". The director talks about the difference between an independent movie and a studio-backed movie.
He says, directing an independent movie is like driving an old beater of a car to get somewhere. It'll probably break down and give you problems; and when they happen you'd damn well better know how to fix them. The upside is that you can take any route you wish and go at any chosen speed, and make any stops along the way whenever things run smooth.
When directing a studio-backed movie, it's like riding in a limousine. Everything runs smooth, and you are in extreme comfort. Any problems will be handled by the studio. The downside is that you want to go a certain direction or make an unscheduled stop, the driver says, "No, we have to get to (wherever) at THIS time by THIS route."
So, it could be the studio called the shots on the crew for this movie. Again, I'm just guessing, but that does seem like a possibility.
