Other mistake: Blood gushed out of the bound man's lower inner arms that were slit with a knife from below the elbow to the wrist (then turned toward the ground). A switch to an aerial view showed no additional blood dripping (while he was still alive). Also, blood would not pour out of his arms to the ground in a horizontal stream like it did. (00:02:04 - 00:02:27)
Factual error: One of the sisters threw a bucket of water over the dock to wash away the blood. Seconds later, the dock was dry. Even with the sun shining, wood does not dry that fast. (00:10:03)
