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.
The Untwist: Liana, "Rochefort" and Balkan were actually trying to get "The Anjou Wine" from Corso all along and knew nothing of The Nine Gates. Varo Borja alone was responsible for the murders of Fargas and Ungern.
Crowning Moment of Funny: In a rather serious movie, there's only one, but it's a good one: Corso finds the Devil reading How To Win Friends And Influence People.
Evil Is Sexy: Liana Telfer seduces Corso shortly after her husband's death in order to get Corso's copy of the book. Also, The Girl.
Familiar: The Girl may be Corso's familiar. Her animal form is the large black dog who appears several times in the movie. She appears shortly after the concept of a familiar is explained to Corso.
Narm: Liana Telfer's hissing and clawing at Corso is rather ridiculous and just looks silly instead of threatening.