Based upon the horror novella, The Visible Filth, by Nathan Ballingrud.
The shirt Will wears, Morgus the Magnificent, is a fictional horror host of a late-night horror show called House of Shock that originated in New Orleans, where the movie is set.
Armie Hammer and Dakota Johnson were both in The Social Network, though they didn't share any scenes.
Overall theme, when you stare into the abyss, the abyss stares back....