This is the final appearance of the Ricardos' New York City apartment set.
Ricky says that he will be 56 in twenty years when their mortgage will finally be paid off. Therefore, Ricky at that point in the show is 36 years old. In reality, Desi Arnaz was 40.
When Lucy gets out of bed you can see she is wearing nylon stockings underneath her pajamas. The toes of the stockings are visible. These were not sox, but hosiery worn with dresses.