While rehearsing for this episode, Lucy found out she was pregnant again. She and Desi thought that this would mean the end of the show, especially since this was the last episode of the season. It was Jess Oppenheimer who came up with the idea that Lucy should be pregnant both on TV and off.
When originally broadcast there was an epilogue featuring Lucy and Desi appearing as themselves breaking the fourth wall to directly address the audience. They sit on a packed trunk and announce they're leaving on summer vacation. They encourage the audience to watch the summer replacement series My Little Margie (1952) and to smoke the cigarettes of their sponsor, Philip Morris. This tag scene was shown only in its original broadcast but is included as a special feature on the DVD set.
This is the final episode of the first season, filmed on May 2, 1952. Five more episodes were filmed in May and June before production halted and resumed again in August. Those episodes were broadcast as the first five shows of season two. (source: "The I Love Lucy Book" by Bart Andrews)
Gale Gordon's second and final appearance on the series due to his getting the role of Principal Osgood Conklin on Our Miss Brooks (1952). Gordon was reunited with Lucy and became a regular performer on her two later series.
Mrs. Mary Ackerman's "reservation" was for 30 people. She "heard" about Ricky no longer being at the Tropicana when Mrs. Miriam Chumley called from the club to inform her. Mrs. Ackerman promptly "canceled" her "reservation."
During Lucy and Ethel's rush to make phony Tropicana reservations, some real guests must have called in to make a reservation. When Maurice is struggling to keep two phone calls straight, he is talking to Mrs. Thompson on one phone and Mrs. Bennett on another phone. These two calls are the final reservations made before Lucy calls in as Scarlett Culpepper and is told that the Tropicana is all booked up. But, as mentioned above, Lucy says that she made her last reservation as Harry and Bess Truman, and Ethel had quit calling from fatigue before she came up to see Lucy. So, Mrs. Thompson and Mrs. Bennett either had to be real people or Lucy forgot who her last phony reservation belonged to. At any rate, as far as the reservations go, Mrs. Thompson called for a party of 4 at 8 pm, and Mrs. Bennett called for a party of 8 at 10 pm.
Interestingly, Lucy chose to make her first reservation under the alias of "Mrs. Worthington Proudfoot," not her maiden name, even though she used "McGillicuddy" for another phony Tropicana guest and as an alias in many other episodes.
List of Phony Guests (in order of arrival): 1. Mrs. Worthington Proudfoot and party. 2. Mrs. Miriam Chumley and party. 3. Miss McGillicuddy, the gum-chewing call girl/floozy. 4. Countess Blueblichki, Hazel, and Unnamed Ugly Woman in Cheap Fur Coat.