Jerry hits Susan in the face with the telephone. Her face is bloodied as she stands up. After she rolls down the stairs into the basement, her face is back to normal.
When Jerry Blake gets the mail out of the letterbox, he finds a yellow envelope for Stephanie, he notices that it came from the Seattle Examiner. Looking worried, he opens the envelope to see his own photo in it. He starts to panic. Then Stephanie arrives home, and asks for her mail. He gives her a copy of Cosmopolitan, and goes inside the house. Later, he goes to a photo shop, and replaces his own photo with another man in a family photo. The man is smiling in the photo Jerry is about to put back in the yellow envelope. In a later scene, Stephanie and her friend Karen are in her room, with the photo of the family man photo Jerry replaced. The man in the photo is not smiling, as he was in the first photo we see of him.
When Jerry changes identities on the ferry, he removes a front piece toupee to reveal thinning hair. However, when - as Bill - he applies for the insurance job, the hairline had receded even further.
When the film first opens, we see a paperboy toss the newspaper onto Jerry's lawn. It lands close to the perimeter of the lawn. But when Jerry emerges later and stops to pick up the newspaper, it is closer to the house.
Paint changes on Steph's back during her fight in school.
Jim says that the murder case from the opening scene was labeled "Inactive". Police would not stop actively investigating a brutal mass murder after only a year, especially with the killer at large. Real life killer John List, who inspired the film, wasn't apprehended until 18 years after the murder.
At about 5 minutes the mother and daughter are raking a huge pile of colorful leaves, however most trees and bushes are still green and only a few other trees are just barely starting to turn, and all grass is very green. The leaves were obviously dumped there.
When Jerry is trying to beat down the bathroom door to attack Stephanie, the mirror on the inside of the bathroom door breaks as Jerry is beating on the door from the outside. As Jerry finally breaks through the door, the mirror is show again, intact, before shattering a second time.
When Jerry Blake is hitting Dr. Bondurant with the 2x4 in the house it is clear that the 2x4 bends on the last hit to his ribs.
Bright sunlight is shown streaming through the windows on both ends of the attic at the same time.
When Stephanie and Paul are outside Stephanie's home getting ready to kiss, crickets are chirping despite it being sometime after Thanksgiving in Washington.
When Susan is shooting Jerry from the bottom of the stairs and the gun misfires, she tries to alleviate the problem by tapping the bottom of the grip, which is a move only for fixing a jammed semi-automatic pistol. It is a way of making sure the clip is all the way in. However, the pistol Susan is holding is a revolver and tapping the bottom will do nothing to help.
It would be more of a blooper if tapping the bottom helped, but it didn't help. And it could, possibly, be attributed to Susan just not knowing what she is doing, but tapping the bottom is not something a novice would do to fix a jam, so someone directing the movie told her to do that.
It would be more of a blooper if tapping the bottom helped, but it didn't help. And it could, possibly, be attributed to Susan just not knowing what she is doing, but tapping the bottom is not something a novice would do to fix a jam, so someone directing the movie told her to do that.
Stephanie picks up the U2 cassette "Wide Awake In America" and puts it in her player. When she presses play, we hear Pat Benatar's "Run Between The Raindrops".
Both times, when Jerry falls through the attic floor to the bathroom below and when he falls backward down the stairs after being stabbed in the chest by Steph, it's very obvious that it's a stuntman and not Terry O'Quinn.
Jerry's disguises would not ultimately work. You can't be married to someone, living with them day and night, and not know they're wearing a toupee or a fake mustache.