Trivia: Since the pilot took place in 1947 (the title card read "New York City 1947") and this episode took place on New Year's Eve 1946, the events of this episode takes place before the events in the pilot.
Ellery refers to his galpal as "Jenny" instead of "Kitty" when he first knocks on her apartment door.
Velie: Don't worry about Ellery, Inspector. I'm sure he's on his way.
Inspector Queen: Yeah, like I was sure he'd made those reservations. I had to tip the headwaiter ten bucks for this table.
Mrs. Velie: I haven't danced like this in years.
Inspector Queen: Neither have I, dear lady.
Lady Frawley: Well, I never!
Halliday: Oh, but you have, my dear.
Becker: I'm going to the bar to get a stiff drink. I may need quite a few this evening.
Velie: Madge is really light on her feet.
Inspector Queen: On hers--yes.
Lady Frawley (to Emma): Where were you, Miss Goody Two Shoes?
Lady Frawley: We ought to sue you for false arrest.
Inspector Queen: No one is arrested.
Kemmelman: New Year's Eve is always bad for me and Ethel. Who wants to invite an undertaker to a party?
Ellery (to cabbie): If I don't get to 124 West End Avenue there's liable to be two murders tonight.
Velie: Any luck, Inspector?
Inspector Queen: It's narrowing down.
Velie: To whom?
Inspector Queen: Everyone in that room.
Kitty: Happy 1947, Ellery Queen.
Ellery: Happy 1947, Kitty McBride.
In "The Adventure of the Lover's Leap" it was noted that two of the characters' last names match those of two notable mystery writers: Raymond Chandler and Ngaio Marsh. Here, one of the characters is named Joseph Kemmelman (or Kemelman; it's never actually spelled out). Harry Kemelman was the author of a series of mysteries with Rabbi David Small, starting with his Edgar-award winning Friday the Rabbi Slept Late, written in 1964.
Arch Johnson would return as Deputy Commissioner Hayes in The Adventure of Caesar's Last Sleep and The Adventure of the Comic Book Crusader.