Other mistake: At the end of a scene showing the dog, the scene is reversed (mirror image) for a moment. (00:08:50)
Continuity mistake: When Rodney is at the bottom of the stairs announcing phase 1 of operation breakup is a success, Samantha is at the top of the stairs. The camera edit is really bad and Samantha jumps forward about 3 feet.
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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