Such a strange yet very effective film.
It's a bit shoddily slapped together but that just makes it better. The editing, music and some of the acting is a bit off but I find it adds to the energy and atmosphere of the film. Bizzare scenes like the Cats birthday party and the mute Lesbian rubbing herself just add to the whole crazed vibe.
I did note some strong similarities between this and Lucio Fulci's The Beyond (1981). A haunted hotel/apartment complex that's built upon the gateway to hell ? The opaque white eyes. The Sentinel even has a solid gore scene that is somewhat Fulci-esque. I do ponder if Fulci had seen and been influenced by this film.
And the cast...my goodness, some stellar names. Ava Gardner, Eli Wallach, Chris Sarandon, Burgess Meredith, Sylvia Miles, Jeff Goldblum, Christopher Walken, Beverley D'Angelo. On paper this is one of the best casts in a Horror film ever. Yet many of the performances were middling and some had very minor roles.