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.
Nightmare Fuel: The stark realism of United 93 being highjacked definitely counts as this—the panic, terror at seeing a fellow passenger stabbed, being forced into the back by a man wearing a fake bomb...everything.
Too Soon: There was much debate over whether five years was sufficient time before attempting a move about 9/11.
Villainous Valor: The terrorist with the red hairband puts up an uncomfortably valiant fight against the passengers
Tear Jerker: Your mileage WON'T vary. You will cry watching this movie.