These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Sir John is a proper, English gentleman who's also a keen shot with a rifle, a keen liar/actor, and a great hunter as he is dressed in different furs and his home is decorated with different stuffed beasts is a testimony of this. He's completely INSANE and a werewolf to boot.
May also be a perspective of the movie as a whole.
Designated Villain: Inspector Aberline is really only an antagonist so far as he's trying to kill the hero. Sir John is the actual villain of the story.
One-Scene Wonder: An uncredited Max von Sydow, in the extended version, as the mysterious man who gives Lawrence the silver cane.
Visual Effects of Awesome: Admit it... the transformation sequences are pretty awesome, just as Rick Baker's incredible makeup effects. No wonder they won an Oscar for Best Makeup.
The Woobie / The Chew Toy: You can't help but feel pretty crappy for Lawrence after his time in the asylum. You feel pretty crappy for him for most of the movie!