I think it's a huge error in judgment to add this whole Angie/Junior story thing. It's the worst thing about the show, and it's completely contrived as the Angie character was killed in literally her first interaction with Junior in the book. That was a very disturbing part of the beginning of the book, so I can understand why they changed it, sort of. However, as with most King villains, there's mental imbalance caused by some external factor running it (in Junior's case in the book, supposedly migraine headaches and a very bad mean streak), as opposed to the Junior of the show just being a super psycho jealous nut job. Because they needed to contrive that, they had to completely change the backstory of the Barbie character, which is also a mistake, in my opinion. It makes no sense that they made him an outsider, as opposed to a homegrown product that went outside. I'm guessing the two kids are basically playing the narrator, because in the set up, neither of them were introduced, from what I remember, though I haven't gotten through the entire set up yet. Last book point is that I would have loved to have seen them do the opening practically verbatim to the book, but it would have been harder for them to do than what they did, which was also quite effective in its own way.