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.
Alternate Character Interpretation: The 2012 film portrays Karenin (played by Jude Law) as a much more likeable character than in the other adaptations, while Anna and Count Vronsky are portrayed as selfish and self-centered characters (not that the film portrays them without sympathy).
Angst? What Angst?: Stepan Akedyevich, at the end. Two months after his sister has committed suicide, and he greets her lover, the man who arguably caused her suicide, with complete calm, like an old friend and a war hero, and a smile on his face.
Hilarious in Hindsight: There's a bit where a serious artist disapproves of Vronsky's dabbling in art while acting as though he is a serious and dedicated artist which Tolstoy compares to having a man hug and kiss a life-size wax doll as though it's a real person. A century or two later, the Realdoll was invented... (Warning, NSFW!)
Les Yay: It's stated pretty baldly that Kitty has a crush on Anna in the earlier part of the book.
Tolstoy deliberately invokes this in the scene where Karenin finally snaps and admits his "thuffering". If not for that moment of Angrish, Anna might have felt remorse; as it is, she can barely keep from laughing, and loses what little respect she had for him.
Purity Sue: Kitty has some traces of this, although her entirety represents purity.
Tear Jerker: The death of Nikolai Levin. Tolstoy based it heavily off of a personal experience that deeply affected him, and it shows.
Then there's the little matter of the title character's fate...
What The Hell Casting Agency: Several reviews for the 2012 film criticized Aaron Taylor-Johnson's portrayal of Count Alexei Kirillovich Vronsky, noting that he seemed out of place in comparison to Keira Knightley and Jude Law.