Louis Zorich and Olympia Dukakis (married in real-life) were offered the roles of Jules and Sophie Berger. While Zorich accepted his role, Dukakis declined the part.
On one show the two brothers are talking about red and gold Kryptonite on how it affects Superman. Red K was first seen in the late 1950s and gold K was seen in the early 1960s. Long after this show takes place