This has a real tongue-in-cheek, "Best In Show" vibe to it. I really can't find anything that I didn't like about it. Oh, sure, a couple typos here and there, but otherwise very humorous - if not a bit dry at times - and very "in" Hollywood stereotypes, which leads me to say you must have been an actress or an assistant yourself. It sounds as if you're writing from experience.
It reads very quickly. Your action was never too long, and your characters had a chance to introduce themselves to us mainly from their dialogue, which I think is great. Gives the reader a good feel for your characters.
Anyway, good luck with this. I had fun reading.