One of the relatives inherits "30,000 shares in Calvada Cotton"
Calvada is the name of the Dick Van Dyke Show's production company.
Laura: (opening a phone book) I don't even know who to call, where do I look?
Rob: Look under numismatists.
Buddy: This is no time to call a fortune teller!
Rob: A numismatist is a coin expert.
Buddy: These are old coins, better get an "OLDmismatist"!
Dick's second dual role came in Mary Poppins.
This is the only episode where Dick does a dual role.