Plot hole: The Man goes completely trigger happy shooting all the walls all around his house, trying to kill Fool, Leroy, and Roach at different points. The police come in and don't notice anything wrong. What about the bullet holes all over the place?

Continuity: In the opening scene when Ruby is laying the tarot cards down for Fool, the cards that she lays down changes position in the following shots, most noticeably the Devil card.

Continuity: When Fool turns the TV around to look at it, in the cellar, he is wearing a plaster on his thumb. In the next shot when he runs away up the stairs, it has gone, and never returns.

Continuity: When Fool hides behind the cat-flap style vent, at the end of the hallway, The Man comes down with his gun. The items behind the vent change position (eg. the cloths, bones, etc.)

Revealing: 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.

Continuity: In one scene where Fool goes back into the house to get Alice, he takes a fire-poker from the fire place. As he walks through the house, you can see the poker is intact. After he strikes "Daddy" you see the poker break. In the next shot, the poker is back, unbroken.

Plot hole: Since Roach has been able to elude Daddy for so long, why couldn't he take a few sticks of the dynamite in the house, rig up the front door blowing it open, and set all of the People under the stairs free?

Continuity: When Fool walks down the stairs, he picks up Spencer's lighter and pad, then gets scared and runs back upstairs. As he runs, between shots the items he holds swaps hands.

Continuity: When Alice talks to Fool in the bathroom about not speaking, hearing or seeing any evil, a tear rolls down her cheek but in the next shot it's gone.

Continuity: In the very beginning, Fool falls down the basement stairs when the man pulls the lever to make the stairs a ramp. He is wearing a purple and black striped shirt. Later, near the end, Fool goes back into the basement on the same stairs. This time, he is wearing a green shirt. When the man chases him and pulls the lever again, we see the same footage of Fool rolling down the stairs/ramp from earlier (black & purple shirt). When Fool gets back on his feet, his shirt is green again.

Continuity: When Roach writes 'Alice' in the white wall, in the first shot he writes it neatly. In the next shot the writing is very messy, then neat again in the next shot.

Continuity: When the Man tells Prince to shut the fuck up, the amount of blood on his chin changes between shots.

Continuity: When Leroy barricades the metal door, her uses a mop. He puts the mop inside a drawer, and the mop head hangs out of the drawer. Later on when the Woman and Man come back, we can now see the mop head is tucked inside the drawer.

Continuity: When Leroy breaks into the back door of the house, the door has nothing on it, yet in the next shot from inside the house as they enter, the glass panels on the door are covered in ivy.

Revealing: When Alice bursts out of the ceiling and knocks the Woman out, her kneepads are visible.

Revealing: When Alice is pushed to the floor, to mop up the blood, her kneepads are visible.

Revealing: When Fool fall off of the edge of the bathtub it is quite obviously a taller stunt double used instead.

Revealing: When the Woman is attacked by the People from under the Stairs, it quite clear that it is in actual fact a stunt double.

Continuity: The items on the corner of the couch (cushion, throw, etc.) keep changing position as Prince first goes to attack Leroy.

Continuity: When Fool goes over and starts throwing rocks into the pond, the brown paper bag beside his foot keeps moving between shots.