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.
YMMV: John Dies at the End
Alternate Character Interpretation: Is John the plucky sidekick, a complete jerk, or more of a hero than the narrator? One was provided by John's creator, portraying him as a guy from a broken home who, rather than Wangst about his past, copes with over-the-top humor.
Crazy Awesome: John. How else can you describe a man who racks up a probably the highest bodycount of monsters using nothing but a folding chair, and makes a chair pun with every kill? Or when trying to get his friend's car back, he chooses to try to piss on the driver to get him to stop.
Special Effect Failure: In the film, the scenes in Korrok's world and the cavern by which it's accessed are done with bluescreen work worthy of a Syfy Original Movie.
Uncanny Valley: The people in Korrok's world wear creepy masks and many of them go naked under the impression that it will make David and John feel more comfortable.
Unfortunate Implications: Dave is somehow reminded of Morgan Freeman by the cop interrogating him, despite acknowledging that he looks nothing like Freeman. The distinct impression is that it's because he's black.
For that matter, he has a short phone conversation with Arnie, whom he pictures as white based on his voice. This causes the spirits that kill Arnie to replace him with a copy that looks close to what Dave pictured but has Arnie's memories. Arnie himself is black, but must not have sounded like the black stereotype, meaning that Dave probably thinks all black people talk alike.
Later, he voices support for the Columbine Massacre due to the horrific bullying he himself endured. Which is rather a Critical Research Failure, as Harris and Klebold's victims mostly had nothing to do with their bullying. It is, however, a very common myth, and it's the cause of the 'loners are school shooters waiting to happen' idea, so it's an understandable mistake.
Word of God: In regards to several character traits and plot points.