Continuity: In the car chase, Campbell jumps into a Ford police cruiser, but in every other scene (including interiors), he is driving a Chevrolet.
Continuity: When Campbell takes the cab from the hospital to the cemetery, the first long shot shows the cab as a Ford Taurus, but the next shot shows a Chevrolet Caprice.
Continuity: Campbell is shown making his phone calls on an Ericsson cell phone, but in the final scene, he is seen activating a Nokia cell phone on the way to the building.
Continuity: When Griffin pulls away from the curb in the blue car, there is clearly no license plate but in the next shot there is a plate there.
Continuity: Near the end of the police chase when Griffin hits the gas pumps, gas is spraying like rain. He then lights it and it blows up. From a long shot we see fire, but then we go back to a shot of his car reversing and it is still raining gas.
Continuity: When they are investigating the first picture, a detective's computer screen shows the third picture that hasn't been sent yet.
Continuity: Right after one of the phone operators tells the caller that there may or may not be a reward for the disappearance of Ellie, they show a shot from behind the phone operator and there is a picture of Jesse (who has not yet disappeared) on her computer screen.
Factual errors: Griffen shoots Campbell in the knee. Later, we see him with a bandage on the knee but completely over his pants. Decidedly not standard first aid procedure.
Plot holes: In the photo shop, Campbell calls Jane Doe I's home and Griffin answers. Campbell then asks his policemen to trace the call when he had consulted her employee file to get the phone number. And anyway, why wasn't he already on his way?
Continuity: When Campbell pulls out drawer in bathroom in his rush to get the syringe, the bottom of the drawer falls out. In the close-up of Campbell's search through drawer, the bottom of the drawer is in place.
Factual errors: Knocking a gas pump off its foundation will not result in gasoline spraying up out of the ground.
Continuity: Campbell's sidearm switches between a Beretta and a Glock between shots when he is chasing Griffin after Jane Doe II was murdered.
Revealing mistakes: Obvious stunt-double or stand-in for Griffin in over-the-shoulder running shots, revealed by his stiff wig.
Continuity: When Griffin breaks into the car he smashes the driver's window with a toilet, yet when he drives off you can see that there is a window when he drives past the first police car.
Continuity: In the beginning of the movie Joel Campbell is doing a voice over David Allen Griffin's dancing as a flash forward; David Allen Griffin is dancing to the Rob Zombie song "Dragula". At the end of the movie, when the scene occurs it's a different Rob Zombie song. He is now dancing to "How To Make A Monster".
Continuity: Two different cats were used to shoot the scenes with the second victim. One cat is darker than the other.
Revealing mistakes: At the end of the movie, just after James is pulled from the river his clothes are almost dry.
Continuity: In the graveyard scene, the bottle of beer Griffin sets on the ground changes position (One moment the paper label on the bottle is showing, the next moment it isn't).
Factual errors: Towards the end of the film, right before Griffin shoots Campbell with the shotgun, we see a close-up of the Glock pistol that Campbell is holding. You can clearly see that the barrel is plugged with only a small hole showing. This is obviously a prop gun, most likely a BB gun.