Hanging in Cliff's office is the emblem for Temple University, a large, stylized letter "T." Temple is Bill Cosby's alma mater.
First appearance of Grandma Anna Huxtable.
Grandma Huxtable (Clarice Taylor) mentions Adda Mae Ward, her long-ago former rival for Grandpa's affections. Taylor famously played Addaperle, the Good Witch of the North, in The Wiz (1978).