Mentioned in dialogue
A painted portrait in the background references the iconic appearance of Christiane in Eyes Without a Face.
Stabbing through a shower curtain.
"Dr. Frankenstein, I presume?"
When Lucie first meets Frank at the restaurant, she says "I thought you would be fat, with long black hair and a greasy face filled with acne". This appears to be a reference to Joe Spinell, star of the original "Maniac" in 1980.
Broken door scene is referenced.
When Frank carries Anna's doll in his apartment, Rita's imaginary version appears and asks "Wanna take a bath?" in the same exact tone as the girl in The Wall.
The first victim of the movie, Lucie, turns on "Goodbye Horses" from Q Lazzarus, a song that Buffalo Bill listens to in "The Silence of the Lambs". Buffalo Bill takes the skin of his victims, while Frank takes their scalps.
scene of severed Achilles tendon
Photograph is shown.
"This is going to be the penile equivalent of the Maniac remake."
title is mentioned
Moose mentions that the original "Maniac" is better than the remake.
Movie is watched by the protagonists in the cinema here.
movie is reviewed