When Millie plays Cleopatra, she imitates the show's executive producer, Sheldon Leonard.
This episode capitalizes on the endless buzz at the time for the over budget Elizabeth Taylor film "Cleopatra" released in 1963.
Here Millie Helper is referred to as "a mother of three." While Jerry and especially Millie are constantly dropping in on the Petrie's, their three children seldom appeared during the show's five seasons. Ritchie's best friend Freddie is often mentioned but is seen in only three episodes. His sister Ellen is in Ritchie's class but appears just twice. Sister Patty, old enough to babysit the younger kids, is never actually seen.
Late in the episode, Rob talks about how difficult it would be to make a musical version of Hamlet. 32 years later, in 1994, Disney released their musical retelling of Hamlet called The Lion King.