Things from the book that didn't make the movie (possible spoilers)
Bill's wife Audra losing her mind and then the end where Bill rides with Audra down the street on his old bike and she wakes up from her catatonic state.
Beverly's husband coming to Derry and Tom bringing Audra to It's lair where she loses her mind and Tom dies of shock from seeing It's true form.
Henry attacking Eddie and breaking his arm again.
The giant storm after It is killed that destroys most of Derry.
Any other things from the book that didn't make the movie?