Trivia: The strange incantation heard at the beginning of the orgy scene is a fragment of a Romanian Orthodox Church sermon played backwards. If you play it backwards you'll notice that there are two main voices (in the movie is supposed to be only one - the voice of the "great priest") and a choir.
Trivia: Kubrick pushed Sydney Pollack to his limits while filming Eyes Wide Shut. Pollack asked how Kubrick wanted him to walk across a room to answer a door. Kubrick said "I don't know, you decide'. Pollack kept trying different ways for the next two days, waiting for Kubrick to approve. Eventually, exhausted, Pollack said he was satisfied, and Kubrick replied 'I wondered how much longer it would take you'.