Revealing mistake: When Leroy is attacked by Prince for the second time, it is very obvious that it is a stunt double. (00:32:05)
Revealing mistake: When Prince attacks Leroy, in some shots it is quite apparent that Prince is just a stuffed animal. (00:32:25)
Revealing mistake: When Fool fall off of the edge of the bathtub it is quite obviously a taller stunt double used instead. (00:42:00)
Revealing mistake: When The Man is trying to shoot Roach through the walls, he shoots the ceiling, which causes dust to fall down. Then, there is a noticable shift, because the dust changes position without a shot change. (00:42:05)
Revealing mistake: When Fool is in the bathroom, the father pokes his head through the door (after firing a rifle at it), and turns to Fool who smashes the toilet tank lid on his head. The blood mark is on the father's right temple, but he was clearly hit in the middle. (00:44:40)
Revealing mistake: When Alice is pushed to the floor, to mop up the blood, her kneepads are visible. (00:49:30)
Revealing mistake: When Alice is forced to sit inside the bathtub of scalding water, as the Woman pushes her inside it, it is quite obvious that the steam rising from the tub is actually coming out from under the tub. (00:50:50)
Revealing mistake: Fool hits the Woman with a fire poker on her shin but she screams in pain and grabs and rubs her knee. (01:11:35 - 01:15:00)
Revealing mistake: When Alice bursts out of the ceiling and knocks the Woman out, her kneepads are visible. (01:23:40)
Revealing mistake: When Alice trips and falls on the staircase, the Woman gets on top of her and tries to stab her. Throughout their struggle, you can clearly see that Alice is in fact replaced by a stuntman. (01:28:00)
Revealing mistake: When the Woman is trying to attack Alice with the huge butchers knife, in one shot you can see it bend and wobble a little bit, revealing that it was fake and rubber. (01:28:10)
Revealing mistake: When the Woman is attacked by the People from under the Stairs, it quite clear that it is in actual fact a stunt double. (01:28:50)
Revealing mistake: After Alice stabs the mother with the knife, the mother begins to take it out. However, you can see that she's taking it out from the side of her body and you can even see the point of the knife on the other side. (01:29:05)
Revealing mistake: When the man pushes Leroy's body down the basement stairs, as his body is sliding down, when it's almost to the bottom, you can plainly see Leroy lift his head up as he's sliding, although he's dead.
