When Hatchet and his accomplices were killed and Tom was looking around in the office, it was obvious that Hatchet and the others were still breathing.
At the end of the movie, Tom is wearing a woolen hat, and the long hair can be seen in many shots. This is inconsistent with the inch hair in the entire film before him.
Just before Plank was shot by an air gun, we saw him turn to the right and his left cheek was exposed. But when he was shot, he was shown guarding his right cheek in close-up shots.
When Doug hit the guy who was hanging on the porch with a golf ball, the first shot used a 5 iron, and the golf club turned wooden in the next shot.
When Winston opened the security door, he left the key in the keyhole. Doug followed Winston and dragged him up the stairs, holding the key in his hand. Next, when Winston reached the top of the stairs, the key in his hand was gone.
