Johnson, Bellevue Hospital, 1918Franco, Johns Hopkins, '22
Wilmerding, Mayo Brothers, '24
To these, Hackenbush replies, "Dodge Brothers, late '29," giving the model and year of his car.
In "Monkees a la Mode," there's a similar set up with writers* at Madame Quagmeyer's Chic magazine who introduce themselves to the Monkees as:
Miss Collins, Vassar, '64Miss Osborn, Bryn Mawr, '63Miss, uh, Delassups, Bennington, '62
Mike responds with, "Mike Nesmith, Eagle Scout, '61." It's not as great a departure as Hackenbush's reply, but the jokes have the same structure.
Perhaps just coincidentally, Hackenbush also mentions Vassar when Mr. Whitmore, the sanitarium's business manager, asks about his medical training: "To begin with, I took four years at Vassar." When Mrs. Upjohn objects, "Vassar? But that's a girls' college," he replies, "I found that out the third year."
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*I had to guess on the spellings of their names.