Marlene Dietrich has a cameo as a guest at the Blue Angel nightclub. One of Dietrich's most famous films is The Blue Angel.
The failure of the original copyright holder to renew the film's copyright resulted in it falling into public domain, meaning that virtually anyone could duplicate and sell a VHS/DVD copy of the film. Therefore, many of the versions of this film available on the market are either severely (and usually badly) edited and/or of extremely poor quality, having been duped from second- or third-generation (or more) copies of the film. The version shown on Prime Video is of better quality than one shown on cable television, specifically FMC or the Family Movie Classics channel.
The film features cameos by numerous Hollywood stars, such as Henry Fonda (a waiter at the Blue Angel), Marsha Hunt (a secretary), Burgess Meredith (a bartender who joins Malloy for a drink), and John Garfield (a man outside Agostini's building).
Barbara says her previous cat was called Hadrian VII. This is a reference to the extremely eccentric novel Hadrian VII, by Frederick Rolfe, about an Englishman who becomes Pope and reforms the Church.
The main actors, Franchot Tone and Jean Wallace, were married in real life.