Samantha is Earthbound - S8-E16
Revealing mistake: When Samantha, Darrin and Dr. Bombay are in the living room and walk as a group towards the television, you can see the crease in the carpet where the floor is going to collapse.
Samantha is Earthbound - S8-E16
Revealing mistake: When Samantha is in the tree at the party, you can see the reflection of the branch against the "sky" revealing blue painted sky.
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 ★