King Leopardi's hit song that Marlowe is listening to when the episode opens is titled, "Lady, You Know My Number."
Marlowe: Too much candy rots your teeth.
Magee: They're false already!
Marlowe: I'm an occasional drinker, the kind of guy who goes out for a beer and wakes up in Singapore with a full beard.
(Marlowe has found two girls in King Leopardi's hotel room)
Kitty: We just stopped by to sell Girl Scout cookies.
Marlowe: Well, no one's buying. So why don't you sew up your pajamas till the longshoreman's convention comes to town?
Marlowe: Hollywood was sweating out one of those summer nights, so heavy you could peel the air off like paint off an old studio lot.
Marlowe: Dolores Chiozza, a face like angel cake and a body to make a bishop kick a hole in a stained-glass window.
Marlowe: In 24 hours, my executive suite had hardly changed at all. Two new bills rushing the first of the month, two chairs that had never been introduced and a carpet a cat wouldn't have kittens on. I needed a case.
Blossom: The King's a friend of mine! Let him in!
Marlowe: Friend, huh? You planning on massaging his trumpet or lifting his wallet?
Dolores: I think Mr. Marlowe would like me to buy him a drink.
Marlowe: Sounds like I just won second prize.
Dolores: What's first?
Marlowe: Letting me buy you one.
Marlowe: Has Leopardi showed up yet?
Bartender: Are you a song-plugger?
Marlowe: Old friend of his from Princeton.
Bartender: (incredulous) Princeton?
Marlowe: (hands him a $10 bill) Coulda been Yale.
Bartender: Upstairs, last door on the right.
"The King in Yellow" was published in 1938. Originally, the protagonist was a character named Steve Grayce, but when the story was republished it was changed to Marlowe.