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.
Bile Fascination: Much of the audiences were drawn in by (negative) word of mouth of how entire theatres bursting into laughter at the sight of "Produced by M Night Shyamalan" during screenings of its trailer.
Broken Base: Some felt that this movie was, while not as good as early Shyamalan, at least a return to form. Others felt it was a continuation of his self-indulgent streak.
Fridge Logic: Why does the old lady has a pepper spray that is used by 1987? Because the devil isn't so keen to details.
The demonstration of "jelly side down" toast. It's supposed to be a tense moment as the one security guard explains the presence of the devil. It's still a slow motion shot of jelly-on-toast falling.
The claim that suicide notes are either all crazy or all rational. This is supposed to sound like the note they're reading is a dramatic exception. Instead it sounds like a gross oversimplification of a complex and incredibly sensitive issue.
The final conversation between the cop and the guy who killed his family.
So Bad, It's Good: Watch it with friends in the right frame of mind and intoxication and it really is hysterically funny. Prime future MST type commentary material. See the What an Idiot and Narm entries for examples.
Most of the people in the elevator, but one can write that off as stress.
Special credit goes to the security guards, who take way too long to call the police or the fire department to get the trapped people out, when in real life, calling both would be the first thing you would do after determining that the elevator couldn't simply be turned back on. They also mention that the elevator company had gone out of business. This naturally does happen in real life, and when it does, a company would be scrambling to get in contact with a new company, because not having an elevator company insuring you is a wonderful way to be sued out of existence.
The guard who believes in the devil at one point drops to his knees, closes his eyes, and begins reciting a Hail Mary in front of the security monitors. Not only is he actively ignoring high strung claustrophobic murder suspects trapped in an elevator with each other, he recites the Hail Mary over the radio so that said trapped claustrophobic murder suspects can hear him. He is doing in Spanish, which thankfully none of them understand, but it still freaks them out. In fairness, though, he was convinced one of the people in the elevator was the devil. Looking at the screen wouldn't stop the devil from killing people, and in fact didn't stop the devil from killing people. He did basically the only thing he personally could do at that moment: pray to God for forgiveness and mercy.
Makes most sense if you think the guard is supposed to be an incarnation of god or Christ attempting to give the cop a chance to save his own and the trapped peoples' souls. In that case it's mostly Narm.
Oh look, a high voltage wire is broken. Why don't I step in the water so I can reach a little further with a stick? Extra points because he had made a conscious effort to avoid the water, then changed his mind because he needed to reach a little further. It gets really bad when you notice there's a 4 inch tall wooden crate bed leaning against the wall which he could have easily laid over the puddle to avoid touching the water.
And he was trying to hang the exposed wire on a nail embedded in a metal framework! From a safety perspective he was not in a "be super careful" situation. He was in a "turn all the power off" situation.
Then there are the cops who presumably know how the main cop's family were killed and allow him to drive off, alone, with the man who has just admitted to committing the hit and run.