Starting with this episode, one side of the Ricardos' sofa was padded to make Ricky appear taller when sitting next to Lucy.
In real life, Lucille Ball was quite superstitious and studied astrology to figure out how to get along better in her marriage to Desi. (Lucy was a Leo and Desi was a Pisces, and in astrology, these two signs are notoriously incompatible.) She actually clung to a numerology belief that Carole Lombard's mother once told her. The letter combination "A-R" was lucky for Lucy due to her numerology make-up, and she whole-heartedly believed this because of gaining most of her fame and career success after being "AR-naz" and "Ric-AR-do." After I Love Lucy, every character Lucille Ball played had the lucky "A-R" combo in their last name (C-AR-michael, C-AR-ter, and B-AR-ker). Legend has it that one reason the main I Love Lucy character names were changed from "Lucy and Larry Lopez" to "Lucy and Ricky Ricardo" was not just because of the nauseating amount of alliteration in the original names, but also because Lucy wanted the "A-R" combination somewhere in her character's name.
This episode was rerun during Lucy's maternity leave, using a new "flashback" intro shot specifically for this episode. None of the rerun "flashback" intros are available to see anywhere but on the show's DVDs. Adding the flashback scenes was one of the best special features the DVDs had to offer. For this episode's flashback, Ricky asks Ethel where Lucy is, and Ethel replies that she's down at the library, looking up numerology again. Apparently, Lucy thinks that Little Ricky's name really should be "Mot Morenzi" because of correct numerology, but she was down at the library to make sure before she really changed his name. Ricky mutters about how ridiculous this is, and how no son of his will be named "Mot Morenzi." Ethel said that he should be happy, because, earlier, Lucy was adding up the numbers incorrectly, and the name was coming out as "Xavier."
Lucy says she's a Taurus in this episode, meaning her birthday would be in late April or early-to-mid May, but in episode #105, she says her birth date is August 6th, making her a Leo. August 6th was Lucille Ball's real birth date.
Mr. Merriweather is a Scorpio, and his original script name was "Mr. Simpson."