Jack mentions that Dennis Day's real name is Eugene Patrick McNulty.
Emma: (elderly woman swooning over Jack) Why, when he stands up there on the stage with that devil-may-care attitude...those baby blue eyes...shivers run up and down my spine, and that hasn't happened since I danced with President Buchanan!
(discussing Jack's European trip)
Dennis: I'll bet you were on the go all of the time.
Jack: Well, yes, yes, that's true. But how did you know?
Dennis: You look lousy!
(Dennis explaining that he met his psychiatrist at an ice cream parlor)
Jack: In an ice cream parlor? How did you know he was a psychiatrist?
Dennis: I ordered a banana split made with a cucumber and he hand me his card.
The bit with Mel Blanc getting drunk while tuning his "instrument" was restaged in Amateur Night on 12/18/1964.