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: Larry had been telling Darrin what it means psychologically that Samantha gave the coat away. Larry said giving it away meant she's happy being married but if she liked the coat it means she desires to be single and carefree. So when Darrin sees the coat, he immediately thinks Samantha doesn't want to be married and the fact that she twitched it means (in his mind) she wants to be a single, carefree witch again.
Bishop73