In the episode's other plotlines, Jerry takes an ill-fated trip to Ithaca with an overly pampering assistant, Kramer returns to his gambling habit by betting on flight arrivals, and George tries to prove he is not racist by getting a black friend.
Jerry plans to meet Bridgette, his girlfriend, at an airport lounge called the Diplomat's Club after returning from a gig in Ithaca, New York.
Kramer, loitering in the Diplomat's Club waiting for Jerry to return from Ithaca, meets a Texan, Earl Haffler, with whom he starts making bets on aircraft arrival times.
Owing thousands of dollars to Earl, Kramer calls Newman to bring serial killer David "Son of Sam" Berkowitz's mail bag to the airport to serve as collateral so they can go double or nothing on the flight from Ithaca.
When George calls for the check, a black waiter says "Sugar Ray Leonard can eat here on the house", which sends him sprinting after Morgan.
Mr. Pitt sees TV news coverage of the swimming pool incident, and recognizes Jerry as the "pharmacist".
[2] Writers Tom Gammill and Max Pross decided to write an episode based around the idea of Jerry getting freaked out by the pilot, with subplots proceeding from Jerry, through well-intentioned actions, causing disaster for the entire cast (e.g. getting Elaine fired by helping Mr. Pitt at the pharmacy, enabling George to humiliate himself by giving him the contact information for Karl the exterminator).
[4] Due to the ambitious settings, "The Diplomat's Club" was the first episode of Seinfeld for which no scenes were filmed live before a studio audience.