When Emil is rushing out of the house with a bag of bloody evidence, he stumbles and falls down on the carpeted floor. When he gets up, he has a big, bloody wound on his forehead. Unlikely this laceration would have been caused by carpet.
After Harper cuts Bea's thumb off, it's clear that her real thumb is tucked under her hand.
Harper's voice is heard while he's cutting off Bea's thumb, but when he himself is shown on camera, his mouth is open but he clearly isn't speaking.
The ghostly residents of Pleasant Valley seem oddly familiar with 1960s dress, hairstyles, speech, and technology for rural Southerners who had died a century earlier.
The Sheriff calls a breathalyzer a "breatherator", although this could be intentional to indicate the "ignorance" of the "rednecks".