Wow, I hadn't heard about the damage from the movie work. I have to say, Dad and I have done some 14 movie/TV jobs and never, ever had any damage done. Now, we never had a car that was used in a movie to the extent that Bill's was used in "Get Low", but still.... I do stay with the car as much as possible, and they know I'm there watching.
Movie folks have a water-based "dirt" that they can spray on to make a car look dirty. I've had that done to my cars on occasion. But at the end of the day, it washes right off (and they wash it).
Nonetheless, if there was any identified damage to a car, that's what the movie company's insurance should cover. While I've never needed to recover damages, I know if I found any, I would submit a claim to their insurance and fight for that to be carried through. I hope Bill did that.