The title of this episode "Hollywoodland" , is also shown at the beginning of this episode, with lights twinkling as it was originally made to do and part of the sign burned down in 1949. It was rebuilt, just as HOLLYWOOD, and the last four letters (LAND) were omitted. One reason given was it was the letter count was 13, as Hollywoodland it was felt unlucky. Up until 1949 when it almost all burned down, and that it was a favorite spot for suicide, they would jump off the letter "D" being #13 of the sign and over the steeper part of the mountain over a cliff.
Hedy Lamarr developed frequency hopping or spread spectrum, and it was more likely to be used with cell phones (or smart phones), as oppose to WiFi. It is especially useful, when the mobile user is moving between cell transmission towers, the "cell signal" has to be handed-off or hopped to a different frequency.
The dress that Lucy is wearing at the Hearst party is a replica of the dress worn by Katherine Hepburn in "The Philadelphia Story".
Barney Balaban, depicted in this episode, was the real President of Paramount Pictures for nearly 30 years. The actor Bob Balaban is his nephew.
Hollywoodland was the original name of the housing development in the area before it was truncated to Hollywood.