Factual error: In chapter 18, when the Losers are in the kitchen of 29 Neibolt Street, Bill mentions that the FBI has a training range consisting of a false street with pop-up targets at Quantico. However, the scene is set in 1958, and the infamous "Hogan's Alley" at Quantico was not established until 1987.
Continuity mistake: Eddie's broken arm changes around, sometimes it's the left arm that's broken, sometimes it's the right.
Trivia: The worst guard at Juniper Hill is named Koontz - after Stephen King's rival in the horror genre.
Question: Why does It leave the picture of Georgie in 1985? The only reason I can think of is to alert the Losers Club, but It doesn't want them to come so that makes no sense.
Answer: It does want the Losers to come to Derry. If you remember, Mik tells that by the site of the Bellwood murder, It painted the words "come home, come home, come home", a clear message to the Losers. In the next part (chapter 10, part 5), they also speak about how It would want them back, to exact revenge on them.
Twotall