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.
Moral Event Horizon: Mrs. Carmody starts off unbalanced (though more conflicted and likeable in the movie than the original story), then becomes the chosen messiah of the people, and starts ordering human sacrifices to the monsters outside. Okay. This is a horror movie. Then she orders David's son and the woman who had been keeping the kid calm this entire time to be thrown to the monsters...
And by convincing her cult to sacrifice Wayne Jessop, she probably attracted even more monsters to the store by putting the smell of blood and an easy meal into the air.
What Could Have Been: The original draft detailed some more details about the setting that was left out. Most noticeable was that there was suppose to be a scene that shows the Arrowhead Project going wrong.