It's So Nice to Have a Spouse Around the House - S5-E5
Plot hole: Darrin tells Serena that it was a good idea to have Endora babysit Tabitha. However, he wasn't even home when Endora left with Tabitha; he was unaware that a sitter was even needed. How could he have known? (00:12:40)
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 ★