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 short story:
Adaptation Displacement: Herbert West: Reanimator was written in 1921 and 1922. The movie has almost completely supplanted it in popular culture.
Values Dissonance: HP Lovecraft was a racistnote In his younger days and earlier stories, very much so. Whether he was/n't or grew out of it is a matter of debate.. Here's how he describes a black boxer in the Re-Animator short stories.
"He was a loathsome, gorilla-like thing, with abnormally long arms which I could not help calling fore legs, and a face that conjured up thoughts of unspeakable Congo secrets and tom-tom poundings under an eerie moon."
Crosses the Line Twice: Okay, West killing Dr. Hill can be justified, he had it coming... But him decapitating him wholly and then re-animating the head and body separately for what amounts to shits and giggles? Seriously!
As usual, he justifies this with For Science!; he's never tried reanimating individual body parts before - and it works! Hill wakes up with his intelligence intact. Of course, bringing that guy of all people back was a bad idea, but at least it impacted how his research continued in Bride.