It Chapter 2: 15 Insane Hidden Details You Definitely Missed

Now this one's a really obscure nod, but it's there all the same.

When the Losers are taken back to the underground clubhouse in the Barrens by Ben, there are lots of pop culture referencing posters on the walls designed to evoke the late 1980s setting. The most prominent is one for The Lost Boys, which is an obvious reference point for Andy Muschietti's take on It, given that it's a story of a group of kids fighting off an ominous supernatural threat.

The films obviously also share fairgrounds as an important setting and there's one particular shot right at the movie's opening in Derry when the camera rises out over a forest, revealing the fair against the darkness of the night. The striking image of the illuminated ferris wheel feels very much like a nod to the quad posters for The Lost Boys which had a very similar ferris wheel as part of the design.

That whole shot actually looks like the bottom half of the poster.