When Audrey and Duke talk to Morris Crane (the Colorado Kid photographer), he describes creatures coming out of the water. They have lobster-like claws and seem to communicate in some form of clicking language. This is a reference to Stephen King's "The Dark Tower" book series. These creatures attack Roland, who barely escapes with his life, but short a few fingers.
Looking through the ME:s notes Parker comes across information about a "firebug" - a pyrokinesis user - in Vermont in the 70's. This refers to Stephen King's book 'Firestarter'.
The reels on the projector spin in opposite directions, stretching and leading to the film breaking, instead of the reels rotating the same direction.
Cynthia Preston also appeared in the 2013 film adaption of Carrie.