It's difficult to write a really good short story because it must be a complete and finished reflection of life with only a few words to use as tools. There isn't time for bad writing in a short story.
The first people that have the information are the hair and makeup ladies and the wardrobe people, because they often have to plan out the clothes: the things that are gonna get bloody, and the different kinds of gunshot wounds they're gonna have to do. They often have more of a preparation, more time, than we do. You can definitely feel on set the actors trying to get that information, and they're of sworn to secrecy.