The opening titles are not printed or written out on screen, but are instead spoken to the audience by Humphrey Bogart impersonator and impressionist Guy Marks. This performance has often been erroneously attributed to Jerry Lacy, who had played Bogart in Herbert Ross' and Woody Allen's Sonhos de um Sedutor (1972).
A decade before working together on this picture, Michael Caine and Natalie Wood dated in real life for approximately two months.
One of several 1970s spoofs of film-noir and hard-boiled detective movies of the 1940s from the likes of Dashiell Hammett and Raymond Chandler, some of which starred Humphrey Bogart, who was the main target of the parodies. The movies included Assassinato por Morte (1976) and O Detetive Desastrado (1978), both from Neil Simon, O Perigoso Adeus (1973), Woody Allen's Sonhos de um Sedutor (1972), O Rosto de Humphrey Bogart (1980), and this movie.
This movie was Natalie Wood's first theatrical movie in seven years, her last having been Bob, Carol, Ted E Alice (1969). In the interim though, Wood did appear in the television movie Ensina-me a Esquecer (1973).
This movie was originally released in a handful of theaters as "Fat Chance." When it finally gained a wider release, the title was changed to "Peeper" confusing potential audiences and effectively resulting in a death knell at the box-office.
Guy Marks: Uncredited, as a man in an alley doing a Humphrey Bogart imitation at the start of the movie, speaking the opening titles. In order to present the credits verbally rather than visually, this film's producers had to negotiate special dispensation from the various Hollywood unions and guilds. The fact that this style of doing opening credits was rarely (if ever) attempted again suggests that it was not a trendsetting concept.