The building used for the exteriors of the Metropol theater still stands in Berlin. It's a club called Goya that's been host to several horror conventions thanks to its appearance in this film.
In Germany, this was released as sequel ("Dämonen 2") to the second film which was released as the first part ("Dämonen").
The name of the cinema (Metropol) can be seen as a building in the first Silent Hill video game.
In the lobby of the theater is a poster for Argento's 1972 film "4 Flies on Grey Velvet.". Other posters include the1980 concert film No Nukes, 1927's Metropolis, and an AC/DC poster, possibly for the 1980 documentary "let there be rock."