Right after the car goes forward and rams the garage door, the view from inside the car when it starts to back up shows an undamaged door.
The "thirty-second" countdown clock takes approximately forty-three seconds to run down.
When the killer taunts Jennifer, (after the dog scene) his note in close up reads "Tricked you, Ha ha" but in the long shot read "Nobody's Perfect"
While wearing a longer flowered skirt, Jennifer is seen ripping up a black mini skirt with a studded silver belt. In subsequent scenes she switches between wearing the flowered skirt and the black mini that she previously destroyed.
When Jennifer puts on her dress, her hair goes from newly done to messy twice.
While the room is filling up with sand, Jennifer crawls to the top, and as she escapes, there is no sand on her clothes.
When Gary busts through the cement ceiling with a crowbar to pull Jennifer out, the cement which is about 4 inches thick cracks too easily. With almost no effort, the cement is broken and a huge chunk is torn away to make room for two people.
In reality, to remove that much cement with a crowbar would take an hour or more with the sized crowbar/pipe that Gary has - and not the few seconds as shown onscreen.
There was next to no effort used in breaking the cement - when in reality, it would be very difficult to remove that much cement with no proper tools.
In reality, to remove that much cement with a crowbar would take an hour or more with the sized crowbar/pipe that Gary has - and not the few seconds as shown onscreen.
There was next to no effort used in breaking the cement - when in reality, it would be very difficult to remove that much cement with no proper tools.
Around 55 seconds, plaster of Paris is seen to be added to some water. Plaster of Paris is a white powder, however, what is seen added to the water is a clear liquid.
When Jennifer undresses for the kidnapper, her reflection on the advertisement in front of her shows that she's wearing bandages around her breasts.
Just before Jennifer Tree is chloroformed by the bad guy, when the drawer opens, the match-box inside is standing upright. With the thrust of the opening that's impossible.
Michael Harney's name is misspelled in the end credits.
when Jennifer is scratch writing through the paint on the glass she is writing as if she is reading it from her side of the glass which would make it hard for him to read through the glass since it would be backwards.
(at around 40 mins) While on the telephone at the beginning a boom microphone is visible tracking along with Elisha Cuthbert's actions in the mirror behind her.
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