Continuity mistake: When Aunt Clara is in the kitchen with Tabitha, when Tabitha knocks off her plate then the unicorn, there is nothing on her high chair tray. When Tabitha twitches the pot and spoon over, there's suddenly a Graham Cracker on her tray where the spoon lands.
Revealing mistake: When Aunt Clara "parachutes" in the background is not the neighborhood background shown throughout series with Kravitz across the street...and no pine forest. It's obvious a stage background.
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.
raywest ★