Trivia: The day this episode aired, March 3, 1966, Alice Pearce (the first Mrs. Kravitz) passed away. The episode was interrupted to announce her passing.
Disappearing Samantha - S2-E27
Trivia: The person who plays Darrin's client in Disappearing Samantha is the "Witch Doctor" in the following episodes.
Follow That Witch (1) - S2-E28
Trivia: Alice Pearce (original Gladys Kravitz) died of ovarian cancer in March 1966 before this episode aired. Abner's sister played the foil in place of Gladys, who would later be replaced with another actress for remainder of the series.
Answer: Telstar was an early communications satellite system. Darrin, in a particularly sexist manner reflective of this era, is saying that telling a secret to a woman means it is guaranteed to be "broadcasted" to multiple people.
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