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.

It (1990)
Ending / spoiler
Starring: Richard Masur, Annette O'Toole, Dennis Christopher, Harry Anderson
Henry, the kid who bullied the seven friends when they were kids, was almost killed by IT, and took the blame for IT's crimes, breaks out of the insane asylum he's in (with IT's help), and stabs Mike, who goes to the hospital (Henry is then killed with his own switchblade). Then, Richie, Ben, Eddie, Bev and Bill go to the underground like place where IT lives. First, IT appears as Georgie, trying to get Bill, but they stop IT and continue. IT is in the shape of a large spider. After IT kills Eddie, Bev kills IT with a slingshot by shooting silver through its heart. They follow IT back to IT's hideout in the sewers, and tear it apart. Then, Bill's wife Audra (captured by IT) is then saved by Bill. Richie then gets a part in a movie. Ben and Bev got married and Bev got pregnant. Bill and Audra packed up, ready to leave the town. Audra had been in a shocked, unable to move or speak state from being captured by It, but does wake up from it.
Sondra
Pennywise: [digging graves.] Take your pick, B-b-b-billy boy. Oh, except for the one on the end. That one's already taken. Sorry!
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.