The actors who play Tom Daly's parents both appear in Bewitched (1964) episodes. Mabel Albertson became well known as Mrs. Stevens in that show, and her husband there was named Frank. In this episode, the boyfriend's dad is played by actor Frank Wilcox.
Grandpa comments that his Mr. Hyde potion "won Fredric March his first Oscar". In fact, March was nominated for an Academy Award 5 times, first winning on his second nomination, for the title role in the 1931 version of "Dr. Jekyll and Mr. Hyde".
The envelope containing the invitation to the Daly masquerade party bears a 1937 Canadian postage stamp with a portrait of George VI.
Mabel Albertson plays the boyfriend's mother. In fact, she was well known for playing the parts of the mother or mother-in-law. In other appearances, Albertson played mother, mother-in-law, or "auntie" to an impressive cast that included Dick York, Dick Van Dyke, Jerry Lewis, George Hamilton, and Dick Sargent, among others.
Grandpa mentions that he's had 167 wives.