This episode contains the first discussion of a witch's lifespan, revealing that it is considerably longer than that of a mortal. Darrin realizes that when he is very old, Samantha will still be very young.
Samantha: Did you want to talk to me about something?
Darrin: Yes. Your birthday.
Samantha: My birthday? Well, what did you want to talk to me about that for?
Darrin: It's a perfectly normal thing for a man to want to know about his wife?
Samantha: You know when it is.
Darrin: I know. But when is it?
Samantha: It's in June.
Darrin: June what?
Darrin: That's kind of a nice day for a birthday. June sixth... what?
Samantha: What do you mean?
Darrin: I mean, how old are you?
Endora: He'll have to know eventually. I'm doing it for your own good. Later on it would be more difficult.