In his autobiography, Harry Reems says that out of the hundreds of films he's appeared in, this is the only one he regrets doing.
Ruby Runhouse and Nina Fawcett were a couple of transient hippie girls who let the filmmakers use their Bedford Street loft as a free location on the stipulation that they both appear in the film. Moreover, their scene took four or five hours to shoot due to the fact that they were both high on mescaline.
Shot in only two days.