- Fan-Preferred Couple: "Agatha Christie's Secret Notebooks" reveals that Lucy Eyelesbarrow (Miss Marple's main proxy in 4.50 from Paddington) would eventually marry Cedric Crackenthorpe, whom many fans detest. Most would rather see her end up with Inspector Dermot Craddock (whom she interacts with only once or twice), or remain single and independent like Miss Marple herself.
- Foe Yay: Inspector Neele and Mary Dove in "A Pocketful of Rye".
- Moral Event Horizon:
- Retroactive Recognition: In A Caribbean Mystery, Tim Kendall is played by Adrian Lukis, much better known since 1995 as Wickham in the BBC's Pride and Prejudice.