Continuity mistake: When De Niro first meets Nolte's lady-friend, they are having a conversation in a bar or restaurant. As the camera goes from De Niro to the woman, the woman's top blouse button is open in one shot, then closed, then open, etc.
Continuity mistake: As Mike scrolls through the microfilm, we see his view as the pages scroll from right to left. The shot then reverses to show his face through the scrolling film, but while the film is now properly reversed, it's still moving right to left in our view. But this reversed angle should show it moving left to right. (00:12:05)
Continuity mistake: When the stairs are first shown, there's carpet up the middle of the stairs. At the end when they flee the house it's gone.
Continuity mistake: Near the start, the bus approaches a curve in the road. 25 seconds later it's approaching the same curve, with the same trees. (00:15:25)
Continuity mistake: In the beginning, after Michael kills his sisters boyfriend, he puts the mask on with bloody hands yet he gets no blood on the mask.
Continuity mistake: When Larry is taken home after being bitten by the werewolf, the door opens and Larry is seen staggering in. In the next shot, the door is seen opening again.
Continuity mistake: When Jenny is hiding in the trees all out of breath, after Vilmer drives off in his truck, the left shoulder strap of Jenny's prom dress is up on her shoulder but then in the next shot it has fallen down her arm. In the following shot it is back on her shoulder! Also there is a flowery corsage on her dress which is on top of a bow which is part of the dress; but in the next shot the corsage is under the bow, then back to being on the bow in the final shot. (00:35:30)
Continuity mistake: When Maddie is coming up with an ending to her novel, she opens one of the ending drafts. Not long after opening the draft, she decides to go on facetime and make a call, whilst the draft is still open, then the man she is trying to contact calls her back. She then closes the laptop and tidies up. When she returns and opens up the laptop, the draft that was just shown on the laptop has become a completely different one. (00:10:10 - 00:14:25)
Continuity mistake: During the sheriff interview scene with Abbey, the time is listed as 3:45am, but later in the scene, the clock reads 2:15am.
Continuity mistake: When the judge is being followed through the town of Copperfield by the two guards, the guards are driving a Ford pickup truck with a standard cab. In the first interior shot of the truck, it appears to be an extended cab truck with a gray interior. In the next interior shot (when they are about to get out), it switches back to a standard cab with a red interior.