* AlternateCharacterInterpretation: Mr. Paravicini sometimes gets this in various productions. Most portray him as a stereotypical Italian who talks a like a this and such. Others however portray him more like an Italian mobster giving him an edge of sorts.
* AdaptationDisplacement: To some degree, anyhow. Think about it: how often do you hear anyone refer to the original short story or radio play ''Three Blind Mice'' instead of the play?
** Although that's partially due to publishing of the short story being banned in its home country until the show stops running. It was, however, released in the United States.
*** A collection of Christie plays has been released in the US, including ''The Mousetrap''. This troper doesn't know if it's been released in the UK as well, but assumes not.
* CrowningMomentOfHeartwarming: The ending. [[DoNotSpoilThisEnding We won't say why.]]
* FreudWasRight: Many viewers think that Christopher Wren is supposed to be gay, based on his mannerisms and finding Sgt. Trotter to be attractive (as a policeman), "terribly hearty", etc. Officially, he's not.
* ItWasHisSled: Averted.
** Although they give it all away at ThatOtherWiki, those killjoys, at least acknowledging it just before they do so.
* NamesTheSame: Christopher Wren, the character, shares his name with Christopher Wren, architect of St. Paul's Cathedral. The character is an architect, as well.
* {{Narm}}: Let's just say some think the endings a bit too sappy.
* NightmareFuel: Oh very much so and not just at the end. Think about it, you're trapped in a little bed and breakfast inn by a snow storm with people you don't know... and one of them is the killer.
* SpoilAtYourOwnRisk: Ignored by the general public.
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