I've read the book! I have it, actually.
I liked it. Not the best, I prefer the show, but it had definite moments. It was pretty dirty at times, but that adds to the charm, right?
Differences... hmm. Well, Dino and Zoey actually had sex (and WTF was up with her being 14?!) and Jackie and Dino didn't end up together.
Well, I don't wanna spoil things. But yes.