After reading the story and watching the movie, this was an interesting third look at the story and how it evolved into the final movie.
The only thing I would have preferred is to have the notes in the back interspersed with the script instead of having to flip back and forth. Although this way it did allow me to read the script uninterrupted, but you could always do this anyway ignoring the notes.
I also hoped this would have more insight into the process of adapting the original story to the script, than adapting the script into the movie. But I guess he was writing to filmmaker's primarily so this makes sense.
He did answer my main question about changing the ending of the story. Sounds like it was suggested to him and he came to prefer the longer ending with more closure. I think it was a fine ending, but I think I prefer leaving the story open ended since the theme is hope and striving for something more without knowing you'll succeed. The movie seems more like a traditional Hollywood ending to me, but it worked.
After the storyboards (at which point I think I was Shawshanked and overloaded) there was a nice surprise with an article inspriring filmmakers and working hard to achieve your dreams.
Oh I almost forgot the introduction by Stephen King which was interesting to see his take on supporting filmmakers. All and all a good book, but time to move on to other things.