Pazuzu is the father of Rosemary's Baby
Is it just me or does the human face of Pazuzu from the Exorcist (1973) look like a grown up version of the revealed Antichrist's face in Rosemary's Baby (1968)? Both faces are revealed as an overlaid image on the film with the same/similar color palette.
Director William Friedkin giving a shout out to the still re-emerging Roman Polanski?
Friedkin was quoted as being a fan of the following horror films: "Psycho, Alien, Rosemary's Baby, the Swedish original Let the Right One In, Babadook, The Blair Witch Project and the first Paranormal Activity." Check on all of those, but I'd add Exorcist to the list. ;) And Philip Kaufman's Invasion of the Body Snatchers (1978).
Source: http://www.hollywoodreporter.com/news/exorcist-director-william-friedkin-i-835016