George Washington Zapped Here (2) - S8-E22
Revealing mistake: When Samantha is showing Martha the washing machine, look at Martha's shadow; it's visible on the "trees" outside the window in the door, making it obvious it is a painted backdrop. (00:05:35)
Answer: The original diamond and white gold heart necklace was given to Elizabeth Montgomery by her then real-life husband, William Asher, who also directed the show. She wore it in nearly every early episode. When the necklace was lost or stolen about mid-way through the series, Montgomery had two replicas made from rhinestones. She wore either one of those for the rest of the show's run.
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