According to Carrie Snodgress, actor Richard Benjamin insisted that he and Carrie not have any interaction off-screen in order to have their onscreen tensions be more believable and authentic.
First credited film role of Carrie Snodgress - though she previously appeared uncredited in Easy Rider (1969). With the role, she earned two Golden Globe wins and her only Oscar nomination.
The Neil Young song "A Man Needs a Maid" was inspired by Carrie Snodgress' performance in the film. Interestingly, a few months later the pair met and eventually became lovers.
The scene in which Alice Cooper tore open pillows and threw the feathers (in addition to bottles of champagne and fire extinguishers) all over the crowd was not spur of the moment or intended just for the film. This was the band's famous gimmick at the beginning, whatever objects they found, they used on each other and the audience. This gimmick was one that earned them the infamous reputation not too long before as "chicken killers". This was probably why Frank Perry asked them to do the movie.