- Hilarious in Hindsight: In the 2002 movie version, Watson is played by Ian Hart. Who would later play Arthur Conan Doyle himself in Finding Neverland
- Ian Hart's portrayal of Watson bears a strong resemblance to Remus Lupin from the Harry Potter films, where Hart played Lupin's predecessor, Professor Quirrell.
- It Was His Sled: There's a reason the trope page doesn't even try to pretend that these days it's a shock that the dog isn't actually a Hell Hound or that Jack Stapleton and his 'sister' Beryl are in fact husband and wife.
- Nightmare Fuel: Legend or not, the hound itself is certainly horrific.
- And the legend itself, as told by Dr. Mortimer.
- In the 2002 adaptation, the Grimpen Mire is fully shown. And it's one of the most unpleasant places EVER in Holmes media, as seen in the scene where Selden barely escapes being engulfed by the quicksand but a policeman chasing after him isn't half as lucky.
- In the Granada version, we actually see Stapleton's death (it's only implied in the book) as he screams desperately for help until he sinks beneath the surface of the mire. It is as horrible as it sounds.
- Values Dissonance: The whole rant by Dr. Mortimer about different craniums comes off as very racist in the eyes of new fans. It's completely cut from the 2002 movie, for example.
- It's not quite the same Values Dissonance as that though. In the book, Watson (a trained medical professional, mind you) privately thinks phrenology is bunk and that Mortimer's ideas are silly. However, phrenology's specific association with virulent scientific racism had not developed yet, and Mortimer's rambling was meant to show him as an eccentric, humorous character rather than an unlikable racist one.
- Also, while phrenology has been by and large dismissed, medical textbooks as recent as 2006 still classify skulls as "Caucasoid", "Mongoloid", "Negroid", and, uh, "Mexican". Which is not surprising: it is true that skull shape is very distinct among different populations, what is not true is its supposed correlation to intelligence or personality or specific behaviors or whichever other bunk associations phrenologists of old made.
- The Woobie: Poor Sir Henry. And poor Beryl and Laura, as well.
YMMV / The Hound of the Baskervilles