I don't know why I bought this book. I have no real interest in writing a screenplay, but I'm interested in movies and the movie business, and the title grabbed me.
This turned out to be an amusing, entertaining books that has great practical advice for anyone interested in writing a screenplay. More than that, although some of the advice is specific to screenwriting, formatting errors for example, much of the advice would be valuable to a novellist.
According to the author (and I believe him) most professional script readers are not looking through manuscripts hoping to find a gem (they've read so many bad scripts they've given up hope of that); rather they're looking for the first mistake that will let them throw your script in the trash, so they can pick up the next one on the pile and be one step closer to going home. This book tells you how to avoid these mistakes, or most of them.
Good solid advice from a working sceenwriter.