When Bentley goes to the employment agency to hire a housekeeper, he and the gentleman behind the desk discuss someone named "Mr. Wilson." It is notable that s that the man behind the desk is played by actor Joseph Kearns, who, just two years later, would take on his best-known role as "Mr. Wilson" the grouchy neighbor of young "Dennis Mitchell" in the sitcom "Dennis the Menace".
Peter says that "in 23 years, niece Kelly will be 36", indicating that Kelly is supposed to be 13 years old on the show. He also says that Bentley will be 59, indicating that Bentley is supposed to be 36 years old.