Continuity mistake: Before Eamon hung his jacket and hat on the nails, there were three nails close together near the right side of the board. When he was hanging his jacket and hat, there were only two nails, which appeared to have more distance between them. When the camera shifted, there were a couple nails protruding to the left of the hat. The single nail that was on the far left side of the board turned into two nails. (00:04:38)
Continuity mistake: The patch of dirt/mud that Briggs had on the left side of his face near his eye when he woke up tied to a chair in Gus' barn disappeared and reappeared (in a different shape) a few times (e.g, when he knocked over his chair, when he stood up, and when he was inside Gus' house). (00:33:12 - 00:36:08)
Deliberate mistake: After Sam freed Gary from being tied up by the aliens, Gary pulled off the cast he got earlier that day and was able to use his left arm as though it had never been broken. (00:45:43)
Continuity mistake: Jenna takes one red cup from the 3 stacked next to the higher stack and returns the two cups to her left (and left of the higher stack). Jenna uses her left hand, supported by her right, to handle the bottle of wine, but the 2 cups disappear after she sets the bottle on the table. (00:19:50 - 00:20:14)
Continuity mistake: Henry's scarf is hanging down loosely and appears to be pinned together near the bottom (by his chest). While Henry is running outside, his scarf goes from loose around the front to having an obvious knot over his right shoulder. (00:02:16 - 00:02:43)
Deliberate mistake: Except in certain angled views of Fred (with Matt in the passenger seat), the rearview mirror is darkened/blackened. (00:08:55)
Revealing mistake: A white truck could be seen in Tamra's rear window, following her car at varying distances. After Tamra hit Randall on his bike, the white truck was still there but gone when the camera returned to a front view of Tamra. Use of a green screen - the truck could not have gone past the accident or "disappeared." (00:03:35 - 00:04:10)
Continuity mistake: When Jackson put the fiberscope/ borescope camera next to the bottom of the door, the light was on, but the light was not on when the snake scope was shown coming under the door on the opposite side. (01:03:06)
Continuity mistake: Inside the building, Nina is at different distances from the man on the bench, ranging from about one body's width to a few widths away (while accounting for her limited movement). (00:15:15)
Continuity mistake: The amount of snow accumulated on the chalet's wraparound porch railing was higher when looking outside compared to external views, such as when Emily was outside talking on the phone with Becca. (00:13:35 - 00:15:05)
Continuity mistake: The "Santa" carrying the Molotov Cocktail walked up the steps and past the decorated handrail, but he was standing within the length of the handrail (about mid-way) when the camera shifted from the right-rear to left-rear side. (00:02:40)
Deliberate mistake: While roasting marshmallows, Henry's marshmallow caught on fire with the flame shooting about 6", then a foot+ high. A marshmallow subjected to such intense heat/flame for many seconds would not be stuck to the stick and stay stuck with repeated forceful flicking or "whipping" of the stick like Henry did. When the marshmallow finally flew off the stick and landed on a camper's head (higher than would be expected), it would be small/hard/charred, not large and still soft/white in the middle. (00:35:03)
Continuity mistake: The placement and angle of the "Not Friendly" sign on the dead security guard's upper right body changes from when Elvis is looking at him down the hall to when Elvis is kneeling next to his body. Initially, the words are perpendicular to the guard's right leg (angled outward to the right), then to the top of his right shoulder. (00:44:45 - 00:45:19)
Continuity mistake: There are two stand-up picture frames on the table. Judy knocks over one picture frame as she walks towards and points mace at Burton. Judy continues holding the mace in her right hand and purse in her left and does not bend over to upright the frame. When Judy leaves, the picture frame is upright and roughly parallel to the other frame. (00:25:45 - 00:27:20)
Continuity mistake: Young Norma Jean is shown a photo of her father placed at the head of her bed. It has him facing right and there is a large white defect in the photo at the upper left corner. When the photo is "talking" to her in a succeeding scene, he is facing left, and the defect is on the upper right corner.
Continuity mistake: Parker is walking straight (legs/feet parallel) when he slips on the apple, but the still-frame photo that Adrian has on her laptop screen shows Parker's left foot at about a 45° angle. (00:04:40 - 00:10:20)
Continuity mistake: Gilbert/Robert was wearing a red pocket square (left lapel) when he was in the phone booth, but not when he came out of the hotel. (00:03:38 - 00:04:36)
Other mistake: Natasha may have been a highly skilled, capable, and experienced fighter (simultaneously taking on multiple large goons with weapons), but this would not mean she was indestructible, injury-proof, or immune from pain. During one extensive fighting scene, just the few heavy whacks on her back followed by being thrown onto her stomach from being held above the goon's head should have rendered her incapacitated (at least for a while) but she did not suffer any ill-effects and continued fighting. (00:34:50 - 00:35:20)
Factual error: Considering everything that happens after Lester comes down the stairs at Samantha's house around 10:05 PM, it is impossible for it to only be 10:15 when she sits down to eat pizza. Their scuffle and Samantha somehow getting Lester zip-tied in a chair alone would take much longer than 10 minutes. (00:15:42 - 00:38:28)
Continuity mistake: Solomon put the rope around his waist underneath his coat, but when he was walking through the woods the rope was tied over his coat. Also, the knot would start out in the front of his left side but change to behind his back even though the rope was loose (not taut) behind him. (00:01:55 - 00:02:26)