Revealing mistake: In the library scene when Richie sees Pennywise the clown, all the balloons filled with blood are popping on people who aren't supposed to be able to see them, but one lands on a lady and you can see her jump as the balloon pops.
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More mistakes in It
Bill: He thr-thr-thr-thrusts his fi-fi-fists ag-ag-against the pos-posts and...
Ben: He thrusts his fists against the posts and still insists he sees the ghosts. That's all it says over and over.
Bill: Th-th-thats w-w-what m-m-my m-m-mom g-gave me t-to h-help with my st-st-stutter.
Richie: I hate to tell you buddy, it ain't working.
More trivia for It
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.
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Chosen answer: It's their way of telling Richie to be quiet. To get him to stop talking.