Gotta say, Blake Snyder both ruined and enhanced movie watching for me! I've lost track of the number of times I've looked at my watch and noted, "Yup. 'All is Lost' moment coming right on time!" or "OK, this character's going to die."
OK, that one might not be Blake Snyder's fault. But as a fer-instance, if you ever see a scene where the soldier/voyageur/guy on a lost expedition looks at the photo of his sweetheart OR talks about the home in Montana he wants to buy (lookin' at you, Hunt for Red October), you know the character's toast.
So -- like Vijaya, I recommend the book highly. Any of the Save the Cat books, actually. The first time you read it you go "I'll never write to formula" and then you see some truly effective films/read an amazing book and realize you can only subvert the tropes effectively if you know what they are in the first place.