The song that Bertie sings in the episode is "Sunny Disposish", composed by Philip Charig and Ira Gershwin. The first recording of this song was in 1926, by Jean Goldkette & His Orchestra.
Bertie: Have you ever seen a floral clock, Jeeves?
Jeeves: I've not had that pleasure, Sir.
Bertie: Oh, well, don't. Have nothing whatever to do with floral clocks. If a friend says, 'Just one more floral clock can't do you any harm,' be firm.
Jeeves: I shall do as you recommend, Sir.
Aunt Agatha: The Innmouth Museum is renowned for its collection of napped flints.
Bertie: Ah, well, that's the trouble, you see... only last week, the doctor said I wasn't even to look at another napped flint. Sad, I know, but...
Aunt Agatha: Don't talk drivel, Bertie. And stand up straight!
Bertie: Did we hear from Biffy again, Jeeves?
Jeeves: Mr. Bingham? No, Sir.
Bertie: No, probably forgotten all about it. Biffy's got the worst memory you've ever come across, Jeeves. Compared with Biffy, I come out as one of the ten great minds of modern times.
Sidney Hemingway: Ah, Mr. Wooster, I trust you have searched the innermost recesses of your heart.
Bertie: Yes, I bally-well have. And the innermost recesses of my bank account.
Sidney Hemingway: I'm sure you'll find your reward in Heaven.
Bertie: Hmm... no chance of anything a bit earlier, I suppose?
(Sidney and Aline laugh)
Biffy: Is it really true you were once engaged to Honoria?
Bertie: It is.
Biffy: How on earth did you manage to get out... I mean, uh, what was the nature of the tragedy that prevented your marriage?