When Paul Drake enters the office in a tuxedo, Della asks him "What kind of a singing job do you do tonight?" It's a clever reference to the fact that one of the jobs William Hopper had as a young man was singing in clubs.
Curiously, several cast members met untimely deaths: William Hopper 55, William Talman 53, John Dall 52, Jana Taylor 60, Jorja Curtright 61, Wesley Lau 63, Billy Halop 56, Ralph Reed 65, Pepper Curtis 49, Don Anderson 59, and Bert Stevens 59.
Joan Staley and Paul Tripp will be united in The Case of the Double-Entry Mind (1962), later in 1962.
Wesley Lau and Paul Tripp were featured as aliens in The Twilight Zone (1959) episode The Fugitive (1962).