- Continuity: The level of the flames changes inconsistently several times during the end sequence.
- Revealing mistakes: When Claire is showing John the piano room (apx. 10 min into the movie), the camera moves backwards and it reveals the shadow of the camera. The camera also touches the piece of cloth covering the piano and you can see it moving.
- Crew or equipment visible: After John Russell discovers the secret stairs he gets to a room with an open door. When he looks into the room, the camera moves back and reveals a shadow of a human head disappearing on the left side of the screen. Either this is fully intentional by the filmmaker or it's a shadow of a crew member. This occurs approximately 34:32 (min.) into the film.
- Continuity: When John Russell first examines the notebook in the attic room, the sticker on the cover says: "C.S.B., January 1909". When he brings Claire Norman to the attic room, she picks up the notebook and reads "C.S.B., January FOURTH 1909" off the cover.
- Continuity: In one scene, the telephone in the limousine is black and in another it's white.
- Continuity: In the beginning of the movie when John Russell is shown walking across the road to the phone booth, the road is packed solid with snow. When it shows him reaching the phone booth, in the background you can see that cars have cleared a path with their tires.
- Crew or equipment visible: During the second part of the séance when the metal flute object is in the center of the table, the camera's point of view descends the staircase and walks into the room. The shadow of the camera operator is visible on the floor to the left, just after entering the room.
- Revealing mistakes: There are no telephone poles or wires going to the phone booth in the opening scene.
- Crew or equipment visible: The next scene after John discovers the small child's room and the music box, Claire is listening to music on the reel to reel tape player. There is a large mirror and several small mirrors built into the mantle above the fireplace behind her. As the camera dollies right towards John, you see the arm of a grip pushing the camera in the small right mirror below the single large mirror.
- Continuity: John's daughter's ball is red and gray with a white stripe up to the point where it bounces down the stairs the first time. When John takes it to the bridge and when it bounces down the stairs the second time, it is all red with a white stripe.
- Continuity: When the Grey car skids (2 minutes into the movie), it swerves in the middle of the road and drives away. But on the next shot the car is parked on the left side, facing the coming truck.
- Continuity: When John is playing the piano towards the beginning, the transom above the door next to the fireplace has light behind it. But, when John is called away from the piano, the transom above the door is dark.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Audio/visual unsynchronized: SPOILER: When the wheelchair swivels to face Claire just before the chase, Claire mouths "Oh S***". However, the audio tries to pass it off as two separate screams, the second of which occurs after she has already shut her mouth.
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