In his autobiography Luis Buñuel claims he was asked by Warner Brothers to work on a story that eventually was filmed as Die Bestie mit den fünf Fingern (1946). "The Exterminating Angel" contains many of the elements of the earlier film including the large mansion, piano recital, and stabbing of a disembodied hand. See more

Goofs

After one of the women exits an adjoining room, she seemingly details a surrealist toilet experience to the other women, upon which they detail theirs. If the adjoining room is truly a bathroom (which would make sense since there is no indication in the film of any hygiene problems related to urination or defecation), it should have been explained why the characters could not simply drink the water from the wash basin there and instead had to resort to breaking a pipe. See more