Visible crew/equipment: In the scene were the adults go back into the sewer, and they have the feeling: "Something is coming", you can see the shadow of the cameraman, twice. One time, coming closer from a pipe, and another time, moving away. Look on the right wall/right on the floor.
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Pennywise: I'm every nightmare you've ever had. I'm your worst dream come true. I'm everything you ever were afraid of.
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.
Question: What is the deal with everyone saying "beep beep" to Ritchie every time he tells a joke?
Answer: In the book it is explained that they are telling Richie to shut up.
Chosen answer: It's their way of telling Richie to be quiet. To get him to stop talking.