Trivia: When the adults walk into the library, you'll see some of Bill's books on display (Bill is described as the Stephen King character), and all of Bill's books (Whether it's the name, topic, or cover picture) are based in some way on Stephen King's books. For instance - The Glowing/The Shining.
Trivia: At the library IT writes something on the type-writer, a verse which Bill tells the others his mother gave him as a kid to help with his stuttering. The verse goes "He thrusts his fists against the posts and still insists he sees the ghosts." In the book, young Bill used this verse to defeat IT in the Chüd ritual.