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The working titles for the film were Bunny and Claude, Bunny, Betty and Claude and Bunny and Billy. Special written acknowledgment is given in the closing credits to the State of New Mexico and the Albuquerque Police and State Police. The credits also note that the soundtrack was available on American International Records. The film was shot on location in Albuquerque, NM and Hollywood, CA. Governor David Cargo, who made a brief appearance as a state trooper, was the governor of New Mexico.
Although most critics did not review the film favorably and stated that the filmmakers wasted the talents of former Oscar winners Bette Davis and Ernest Borgnine, the New York Times critic felt that Davis delivered one of the "funniest" performances of her career. According to a August 23, 1971 Daily Variety article, Davis sued American International Pictures (AIP) for loss of income and damage to her career for changing the film into a "slapstick" production, after she originally had signed on to Bunny O'Hare as a "humorous social commentary." She also charged AIP with altering the script she had originally approved, in the final editing.
According to a March 20, 1972 Daily Variety article, credited writer Stanley Z. Cherry also sued AIP. Cherry claimed AIP still owed him $13,400 for the script and also asked for 5% of the film's net profits. The outcome of either suit is unknown. According to the 1971 Filmfacts review, after Davis finished shooting the film, new footage was shot, most likely written by and possibly directed by, John Astin, in Hollywood, which changed the original scope of the film. Davis and Ernest Borgnine had last appeared together in 1951 M-G-M release The Catered Affair (see below), in which they co-starred.