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Revealing mistake: The location of and distance between windows on the mobile home should stay the same, but do not. The home's exterior is constructed of vertical boards/slats, which can be used to make a rough estimate of the number (then distance). Initially, there were about 24 vertical boards between the shortest window and the window to its right (on-screen). When David and Anne were close to the house, there were a lot more boards between these windows - closer to 36+. The mobile home was "fabricated". (00:02:18)

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Revealing mistake: The Uber car's instrument panel did not appear to be functional (indicating it was fake). On the driver's side, the numbers in the two large circles were not discernable, but one had to be the speedometer. On the left side, the arrow pointed to maybe 6 MPH, even when the posted speed limit was 60 MPH. The gauge on the right side stayed at the bottom of the left side at zero. (00:09:50 - 00:13:05)

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Revealing mistake: The covering of snow was not real snow. When the trick-or-treaters are first seen, there are images of footprints (shoeprints) in the snow, but the trick-or-treaters walking over the "snow" do not leave any footprints. (00:44:38)

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Revealing mistake: The staircase to the second floor bedrooms is awkward, not in proportion to the rest of the house, and usually only the section that is needed for a particular shot is shown (and the section is most likely a replica). In particular, the staircase would be quite steep - and extend well into the attic! - if the upper portion continued at the same grade/angle as the lower steps. The perpendicular entrance is too short and both posts are not always on the floor (one may be at the end of the steps). (00:23:04 - 00:28:12)

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Revealing mistake: When Grandpa Paul Rivers (probably a substitute of some kind) was falling (pushed) down the stairs, his body was "floating" and not actually making contact with the steps. (01:33:30)

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Revealing mistake: Emmet held a cigarette lighter, displaying a fairly high flame for a long period of time and even held the lighter sideways in his palm without burning his hand! If it were a real flame, he most certainly would not be able to hold it lit very long and would have burned his hand. (00:24:25 - 00:25:25)

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Revealing mistake: The "baby" looked quite "rubbery" at times and its limited movements (even motionless) and lack of sound are indicative of a "fake" baby (doll) most of the time. The baby was mostly kept covered in some kind of box and did not even cry when the mother was running with it (while in her arms or in the box). (00:14:35 - 00:20:30)

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Revealing mistake: After Charlie talks to Emma in Francine's old bedroom and is standing in the doorway, the background (segment of the hallway) is obviously fake. Shown are less than five of the top steps on the staircase, only a fraction of the size of real steps. The lower section of the banister is also a reduced size. (01:31:35)

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Revealing mistake: The cement block section of the house by the front door that Greg was painting "changed" to a flat board for a short time and then went back to the blocks. (01:05:28)

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Revealing mistake: It is obvious Dottie's bat did not make contact with the ball when she hit the home run, and the sound of a bat hitting a ball was a little off. This is true for many others at bat during the movie. (00:11:50)

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Revealing mistake: When Jimmy is talking to Dottie by her car, shots facing Dottie show her standing near the rear of her car, but shots facing Jimmy place Dottie close to the driver's door. Dottie is close to Jimmy (near the front) when he leaves, but is next shown taking a few steps from the rear of the vehicle to reach the front (where she just was). (01:30:46 - 01:32:08)

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Revealing mistake: When Poole arrives at the accident scene, both vehicles involved are in different positions. Kevin's SUV is partly in front of the Food Mart. Frank Lyga's car is about twice as far away from the SUV, the front is angled outward, and it isn't even close to the curb. Also, there are parking spaces to the right of the Mart, but not the handicapped parking that was there earlier. (00:19:26)

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Revealing mistake: After Frank shoots Kevin and Kevin's SUV hits the curb, the background/scenery changes as well as the position of Frank's car. Frank initially pulls along the curb (behind the SUV) with his car at about a 30° angle. The next time Frank's car is shown, it is almost perpendicular to the curb and the Food Mart. When Rupple and Frank have their guns aimed, they would be aiming inside the Mart, not toward Kevin. Objects in the background also change (e.g, fire hydrant, telephone pole appear). (00:16:48)

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Revealing mistake: The "bridge" within the crime scene tape is obviously a prop. It should be a continuation of the road, but it is tilted to the left and is more vertical (around 45°). The bridge isn't even very high. When Byron and others go under the bridge to look at the dead girl, there is only a few feet above their heads (clearance under the bridge). (00:04:54)

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Revealing mistake: The 3-light tree floor lamp in Soren's house (upstairs where Lucas and Thor encountered Hannah and Lily) has "fake" lights. Instead of seeing light from actual bulbs, each is simply a solid white circular shape. (01:16:30)

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Revealing mistake: The "unnatural seam" (line) across Jimmy's forehead and beyond - as well as the overall appearance of his head - indicates that he is NOT "naturally bald"! His "fake" bald head was not put on nearly as well as those seen in numerous other movies. [The actor playing the character does not have much hair in real life, but he also doesn't have that artifical line across his forehead.]. (00:07:13)

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Revealing mistake: The palm trees next to the building Arthur came out were not real trees. One is flush against the front wall of the building and another is in a nearby corner. The palm tree in front looked completely flat - like a large piece of cardboard or maybe painted on the wall. Palm trees should be at least 30' away from a structure as well as outdoor pipes, buried lines, etc. They grow a big central root below the trunk and MANY thin roots running horizontal close to the surface - some may be exposed. (00:05:51)

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Revealing mistake: Deacon uses "hidden" food to get the dog to come up to him. The "treat" is largely concealed - but the dog's slobber gives it away. The camera shifts after Deacon's hand goes next to the dog's mouth, giving the impression that Deacon is just petting the dog under his neck. (00:06:35)

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Revealing mistake: The backgrounds during the pawn shop scenes often change, suggesting the use of a "green screen." For example, the grandfather clock was behind the clerk to his left, then not there, but back again. Sometimes shirts are hanging in the front windows but other times there are other items there. (00:47:57)

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Revealing mistake: Much of the cemetery scene with the Mentor was "green screened." The backgrounds were inconsistent (e.g, trees and tree trunks) and sometimes the Virtuoso's and Mentor's head were practically together when facing each other. The sizes of their heads also varied at times. The Mentor also was at an angle to the Virtuoso during his long speech, at least giving the impression that he was using cue cards to remember his lines. A couple times, the Mentor looked like he lost his place. (00:15:24)

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