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* BrokenBase: Opinions are split on whether showing the demon in closeup (or showing it at all) adds to or detracts from the film. The closeups were a result of ExecutiveMeddling -- director Creator/JacquesTourneur wanted the demon to be barely glimpsed.
* RetroactiveRecognition: Rand Hobart is played by Creator/BrianWilde, who would later be best known for playing Mr. Barrowclough in ''Series/{{Porridge}}'' and Foggy Dewhirst in ''Series/LastOfTheSummerWine''.
* SpecialEffectFailure:
** From a modern perspective, the closeups of the demon are more likely to inspire laughter than terror. The demon's smoky long shots, however, hold up pretty well.
** In the scene where Karswell's cat Graymalkin turns into a leopard and attacks Holden, Dana Andrews is pretty obviously wrestling with a taxidermy model.
** When Karswell leaves the train to chase the parchment with the runes, you can clearly see the wire on which it's hanging.
* SugarWiki/VisualEffectsOfAwesome:
** Although the closeups of the demon's face haven't aged particularly well, the puppet looks quite impressive for the 50s, especially when it's shown from afar and wreathed in smoke.
** The scenes where we don't see the demon itself but rather the effect it's having on the world, like the smoking hoofprints in the forest being left by [[NothingIsScarier something we can't even see]], are very effective.
* WatchItForTheMeme: A lot of Music/KateBush fans found out about this film through her song [[https://www.youtube.com/watch?v=VerK4zwMRQw "Hounds of Love"]] from the [[Music/HoundsOfLove album of the same name]], which opens with the sampled line "It's in the trees, it's coming!"
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