The two actresses portraying the women from the Historical Society, Carol Veazie (Mrs. Wicks) and Isabel Randolph (Mrs. Bixby), both played Rob Petrie's mother on the Dick Van Dyke Show (1961).
When Barney is discussing his family tree, he mentions the name "Duncan Phyfe" marrying a relative of Nathan Tibbs, the Revolutionary War hero of the episode. Duncan Phyfe was a 19th-century furniture maker.
When Barney Fife mentions the name "Duncan Phyfe," Andy tells Barney that Duncan Phyfe's last name is spelled "P-h-y-f-e," whereas Barney's is spelled "F-i-f-e." In reality, Duncan Phyfe's father's given name was Donald Fife, spelled just like Barney's last name.
Andy mentions that Barney's middle name is Oliver, and later, in "Class Reunion," his yearbook shows it written as Milton, but for the most part his middle name is just the letter P.
Although Mayberry is a dry town, Mayor Pike serves champagne to toast Otis for being a descendant of Nathan Tibbs.