Character mistake: When Darrin is on the deck of the yacht, he says something about the salt air. The problem is earlier he was told that he was going to Chicago to meet Miss Marshall for a dinner meeting. The only body of water to support a yacht 3 miles off shore is Lake Michigan which is fresh water.
Character mistake: Samantha calls Darrin's mother "Mother Stephens" throughout episode. In most episodes, she is "Mrs. Stephens." I can't find any other episode where she is "Mother Stephens".
Adam, Warlock or Washout? - S8-E14
Character mistake: In Season 3, Witches and Warlocks are My Favorite Things, Maurice says he won't stay for Tabitha's testing coven because it's "women's work" but in this episode, when Adam is finally tested, he arrives and says he wouldn't miss seeing his grandchild being tested.
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