Deliberate "mistake": Jack says, "Wendy, baby, I think you hurt my head real bad" as he's locked up in the storeroom, and the camera shoots up at his face from the floor. If you look closely extra boxes were moved in on the left and right above his head. The boxes in this shot extend past the frame of the door, in previous and subsequent shots the boxes are at least six inches away from the doorframe. Submitted by ????

Continuity: After he picks up the lipstick Danny walks over to Wendy as she sleeps. If you look closely the magazine underneath the end table has a picture of a woman on the cover. In the next shot as he writes "Redrum" on the bathroom door, there's an entirely different magazine on top of the pile. Later as she takes Danny into the bathroom while Jack is hacking down the front door, there's yet another magazine under there. Submitted by ????

Continuity: Danny picks up the knife that Wendy brought up from the kitchen and we see a pack of cigarettes and a blue lighter in front of the lamp on the night table. They have all been removed in the next shot as he prints "Redrum" on the bathroom door. Submitted by ????

Continuity: As they run into the bathroom to hide from Jack, Wendy locks the door behind them and it's clear to see that there's no coat hook on the back of the door. Two shots later as she throws the knife into the sink we see a perfect reflection in the mirror of a coat hook on the back of the door. Submitted by ????

Other: Grady knocks on the storeroom door as Jack sleeps on a sack of rice. If you look closely his head wound is still bleeding but after he gets up there isn't a drop of blood on the sack of rice where his head just was. Submitted by ????

Deliberate "mistake": When they cut to the shot inside the apartment as Jack breaks down the front door, the slivers on the inside of the door are rearranged between shots so that the ax head pulls them out easily. Submitted by ????

Continuity: Wendy gets Danny out of the bathroom window and slides him down the snow drift to safety. If you look closely after she does this we see her again in a close-up and the snow in front of her is fluffy again and shows no evidence of it being disturbed. Submitted by ????

Other: The snow drift that Danny slides down to get out of the bathroom window looks as though it's been tamped down all the way up to the window after it was sprayed into place by the crew. Submitted by ????

Continuity: Jack starts to break down the front door of their apartment with his ax as Wendy runs into the bathroom and opens the window three quarters of the way as she tries to get out. In the next shot from outside the window is almost closed. Submitted by ????

Continuity: As Danny picks up Wendy's lipstick there's a red pearl necklace draped over the jewelry chest in the center of her bureau. No one goes near it but when we see this spot again as Wendy sees "Redrum" reflecting in the mirror, it's gone. Submitted by ????

Continuity: As Jack starts to break down the front door of their apartment, Wendy runs Danny into the bathroom and we see the bookcase to the right of the bathroom door again. We saw the bookcase before Danny wrote "Redrum" on the bathroom door and even though no one went near it the books in the middle shelf have been rearranged. Submitted by ????

Continuity: Jack walks into Mr. Ullman's office to break the radio and the lights come on before he reaches the light switch. Submitted by ????

Continuity: Wendy runs out of the storeroom and locks Jack in, and we see a large rectangular indentation in the storeroom door above the door knob. Later when we see the door in the close-up of him talking to Wendy the indentation is not there. Submitted by ????

Continuity: Wendy drags the unconscious Jack to the storeroom and has a little trouble opening the latch. She pulls the bolt out of the latch and it flies off to the left. In the next shot the bolt is dangling on the right side of the latch. Submitted by ????

Continuity: Wendy drags Jack across the dirty floor to the storeroom and we see dirt on the seat of his pants as he gets up and rushes to the door as Wendy runs out. The next time we see the back of his pants he's still in the storeroom but they've been cleaned without a spot of dirt on them. Submitted by ????

Other: Wendy drags Jack from the Colorado Lounge to the kitchen and it's the middle of the day with the sun out. It must be after 8:00AM because at the beginning of this scene we're told so. She immediately takes him into the kitchen and the clock on the wall reads 6:55. There's nowhere in the North West where the sun is out at this time of day during the winter months. Submitted by ????

Other: After Jack takes the fall down the steps the film jumps as the cameraman pans too quickly to the right and hits something. Submitted by ????

Continuity: After taking a full swing wallop to the head with a Carl Yastrzemski bat like Jack did, there should be some blood on his head as he falls down the stairs. There isn't (not necessarily a mistake) but there's suddenly plenty in the next series of shots as she drags him to the kitchen. Submitted by ????

Continuity: After dragging him into it, Wendy runs out of the storeroom and closes the door twice as she locks Jack in. Submitted by ????

Continuity: In The Colorado Lounge, Wendy goes through the box of Jack's typewritten pages and we see the seam of the table run underneath the middle of the box. Several shots later as Jack walks in, the box has been moved and the seam runs underneath the top of it. One could say Wendy moved the box when she went threw it, but she didn't touch the jar of pencils, which in both shots stays in exactly the same spot relative to the box. Submitted by ????