Sammy Davis Jr., guest starring in The Greatest Entertainer in the World (1967) at the time, visited the set of "The Monkees" and filmed a cameo which remains unseen to this day.
The three assistants for Mrs Quagmire give their college and year of graduation, e.g., "Miss Collins, Vassar '64", "Miss Osborne, Bryn Mawr, '63", "Miss Delasips, Bennington '62". All three are elite and, at the time, all female colleges.