When Ezra is feeding Ma Cobb, she begins spewing blood from her mouth and nose. She turns her head slightly, and the tube that the blood is coming out of can be seen.
When Ezra is clubbing Mary Ransom to death, the blood is clearly coming from the club, not her head.
When Ezra digs up Ma Cobb's corpse from her grave, her arms have turned entirely to bone, but no flesh is missing from her face.
Although the film is supposedly set in the United States (U.S. money is shown), the cars in it have Ontario (Canada) license plates.
Although set in the mid-west United States, when Ezra is speaking with Sally Mae in the general store, a rack for the Toronto Daily Star newspaper is visible.
In the film's original theatrical trailer, Sally Mae is referred to as "Christine".