After the success of his 1968 breakthrough, De Palma and his producing partner, Charles Hirsch, were given the opportunity by Sigma 3 to make an unofficial sequel of sorts, initially entitled Son of Greetings, and subsequently released as Hi, Mom!. While "Greetings" accentuated its varied cast, Hi, Mom! focuses on De Niro's character, Jon Rubin, an essential carry-over from the previous film. The film is ultimately significant insofar as it displays the first enunciation of De Palma's style in all its major traits – voyeurism, guilt, and a hyper-consciousness of the medium are all on full display, not just as hallmarks, but built into this formal, material apparatus itself.