In the movie the words "Beep beep, Richie" are often used. In the novel it is explained that this phrase is meant to get Richie to shut up.
The movie the children are watching when they drop drinks and popcorn on the bullies is I Was a Teenage Werewolf (1957).
On the DVD commentary track, the actors note that Tim Curry's characterization of Pennywise was so creepy and realistic that everyone avoided him during the filming.
When Beverly is listening to the voices in the drain, one boy identifies himself as Matthew O'Connor. Matthew O'Connor is also the name of the Supervising Producer of the film. A girl in the drain identifies herself as Vicky Burrows. Victoria Burrows did casting for the movie.
Jarred Blancard (young Henry Bowers) hated having to call Marlon Taylor (young Mike Hanlon) a "nigger", and would often apologize to him before and after filming for his character's excessive use of the slur.
Most of Steven King's books take place in Maine in the Bangor area and in a fictionalized town. The book was written and finished in Bangor also.
Jonathan Brandis and John Ritter both died tragically in 2003. Brandis hanged himself, while Ritter suffered an unexpected, fatal heart attack.