Mary Ellen Mark, a documentary photographer, was asked to go to bars and take pictures of the bars to play during the opening credits. The director rejected the pictures because they were "too realistic."
When Teresa meets Tony in the bar, she is reading "The Godfather", just as she does in the original novel. He comments that he has seen the movie. Diane Keaton (Teresa) plays the part of Kay in The Godfather (1972).
One of two feature films that actress Diane Keaton starred in in 1977. The other film was Annie Hall (1977) for which Keaton won the Best Actress Academy Award. Keaton was not Oscar nominated for her performance in Looking for Mr. Goodbar (1977). The movie did receive two Oscar noms though, for Best Actress in a Supporting Role (Tuesday Weld) and Best Cinematography (William A. Fraker) but failed to win either.
Director Richard Brooks interviewed around 600 women who had read the film's source novel. This was so as to connect with the film's "magical key" which was the popularity of the book which had become a best seller. Brooks used the meetings for insight and feedback in preparation to make the picture.
The scene when Theresa meets Tony starts with a closeup of the book "The Godfather" by Mario Puzo. Tony walks up and says, "Hey, I saw this movie. Pacino is something." Theresa smiles and just nods. Diane Keaton was in the movie "The Godfather.' She also had an on again/off again relationship with Al Pacino for several years.
In the brief scene when Katherine's new husband Barney (Joel Fabiani) is introduced to her family, he also meets Mrs. Dunn (Priscilla Pointer) for the first time. Both Fabiani and Pointer had been at the San Francisco Actors' Workshop in the early 1960s, appearing together in stage plays such as "The Marriage of Mr. Mississippi".