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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It the miniseries is a 1990 Horror/Thriller with Tim Curry as the title character, a monstrous creature who mainly preys on children and their worst fears. A small group of kids and, 27 years later, adults challenge and then defeat Pennywise the Clown. Watch for Tim Curry, but stay for the rest of the group. Compare and contrast with the 2017 version. Disappointing ending.
More mistakes in It
Pennywise: I'm every nightmare you've ever had. I'm your worst dream come true. I'm everything you ever were afraid of.
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.