This is the last of five episodes that Jack Soo missed at the end of Season 4 because of his cancer. He nevertheless was in the opening credits for each of the five episodes, and there is a reference to some mail for his character, Nick Yemana, in this episode. He would return for the first nine episodes of Season 5 before leaving the show permanently. Still, he was in the opening credits for all episodes of Season 5. He succumbed to the disease in January 1979.