FILM 1331: IT FOLLOWS
TRIVIA: The poem that Kelly's English teacher reads out loud is TS Eliot's "The Love Song of J. Alfred Prufrock". The poem seems to share some commonalities with the film.
The theatre featured at the beginning of the film is the Redford Theatre, a historic Japanese style theatre with a fully functioning Wurlitzer organ, in the Old Redford neighborhood of Detroit, MI. The Evil Dead (1981) premiered there.
The dilapidated house that Hugh hid out in and that Jay and her friends explored is a house style called the American Foursquare. This style was popular from the 1890s through the 1930s. Many floor plans for the foursquare feature "circular" traffic patters where one can proceed through several rooms and return to the starting point without ever reversing the path: kitchen, vestibule, living room, dining room, and kitchen, for instance. In some homes, adjoining bedrooms shared closets and bathrooms. This kind of "fluid" floor plan would make this style of house particularly desirable if an escape from "It" was needed.
Some of the cars shown are from more recent times. Some are shown to be from the 60s to late 70s era. The time frame in which this movie is actually set is unknown as some of the technology does not exist, let alone could exist in the supposed "retro" area.