This is what my copy looks like after finishing: 
There was so much inside that head that I just wanted to remember, or come back to, or... just highlight. I could have done all of that on my nook, and it would have been easier. Simpler, less restricted as to what I could fit onto the post-it, but... I dunno. This way just felt right to me.
There were a lot of references to books that I hadn't read yet, and these sections I tried to skim so that I could get the idea without the spoilers, but that wasn't always possible. I do hate spoilers, but I can't hold it against King too much, I knew that was a possibility when I picked this up. One doesn't read an examination of the horror genre without expecting examples... and I'm just NOT that well read to think that I would've read every book he might have mentioned. Not by a loooooooong shot.
But the books that I have read, I now have a new and deeper appreciation for. King sees things in such a different way than I do, and so getting his perspective is fascinating.
Highly recommend reading this.
PS. Support your local used book stores! :D