The short musical burst when the Leper vomits on Eddie
I've read many comments that say that the music was so out of place at that moment. I fail to see why, as the first IT movie had a few musical moments that were also odd, like the Rock War music, the tiny burst of New Kids on the Block when Beverly sees Ben's poster on his door, and of course, the blood-covered bathroom cleaning montage.
Some people are so picky over nothing, sometimes.