- Moral Event Horizon: Robin crosses it when he kills Mrs McGinty and frames James Bentley for the crime, and later kills his adoptive mother, Mrs Upward, who had taken care of him all his life.
- Unintentional Period Piece: A key part of the solution is Poirot's realization that "Evelyn" is actually a Gender-Blender Name. In the 21st century, "Evelyn" is one of those names, like Lynn and Ashley, that were once unisex but now are predominantly feminine.
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