Revealing mistake: For the first kill, Warren is chasing the naked girl while being equally naked. And yet, in the side view of his run in the woods, Gene Davis' pants pop in frame a couple times. (00:08:00)
Factual error: When the coroners are taking Betty Johnson's corpse on a stretcher, her head is uncovered. They cover the heads of corpses. The head is only uncovered if the patient is alive. (00:12:35)
Continuity mistake: Continuity is blatantly disregarded during the first scene with the coroner; Wilford Brimley's arms are down his sides, in front of his gut, down his sides again, very obvious. (00:13:05)
Continuity mistake: The recorded playback of Warren's statement sounds much different than when he actually recorded the statement. (00:35:45 - 01:00:45)
Continuity mistake: At the end, when the naked killer is kicking the door, there is blood on the door from his feet. Several shots later, the blood on the door changes even though he has stopped kicking it. (01:34:45)
Continuity mistake: At the end, just before Bronson shoots Warren in the forehead, Warren's hair goes from messy to perfectly neat. (01:39:45)
Revealing mistake: After Lori burns Warren's cheek with the curling iron, then runs out the door. He screams in pain as he turns away from the camera. But there's no burn scar in the next shot of his face.
Revealing mistake: Near the end, after Warren kills the girl in the shower, he taunts the cowering roommate in the corner. And then when he pulls back, there is blood spatter all over her, and the walls Yet he was still in a standing position, instead of bent down to do any real damage.
Revealing mistake: During the girl's funeral, the father mentions to the detective about her keeping a diary. Warren overhears and then "somehow" just happens to know where the girl lives, and breaks into the house.
