Near the beginning of the film, we see Ashley painting a girl in red on the wall. We see that Ashley has painted the girl fully in red, however, in the next shot we see that the girl has a white space where the red paint was before.
Ellison finds a scorpion in the attic of the house when he first ventures up there. We find out later that the house is in Pennsylvania. Scorpions, mostly found in subtropical climates, are not native to Pennsylvania. When Ellison mentions it to the deputy, he reacts as if it was a normal occurrence, rather than pointing out that it would have had to have been planted there.
One of the last scenes, Ellison retrieves firewood from outdoors, where it is raining. He then proceeds to make a perfect, non-smokey fire. This is impossible given the humidity that would have seeped into the wood.