The title song, "Days of Steam," was written and performed by John Cale, a founding member of the group The Velvet Underground. The song is taken from Cale's album The Academy in Peril (1972, Reprise). Andy Warhol agreed to do the cover art for the album in exchange for the use of "Days of Steam" in the film.
Andrea Feldman jumped out her window and killed herself three weeks after filming.
The part of "Aunt Harold", credited to "Harold Childe", was actually played by renowned artist Harold Stevenson.