Revealing mistake: When we see the funeral, the coffin is lying on wooden planks across the grave as it should be. However, the green sheet is perfectly flat, but not stretched, showing there is no hole under the coffin. (00:45:00)
Revealing mistake: When Alison is holding on to the Titus, Gary tries to save her, and they are seen dangling in the air by the tornado. In the shot of Trey looking out the bank window, you can faintly see wires attached to Alison to make her dangle in the air.
Revealing mistake: In the Kentucky church-massacre scene, Harry briefly scuffles with a man in a light blue sweater. Harry elbows him in the ribs, sticks a grenade in the man's pocket, spins him around and delivers a crushing blow to his neck, then hurls him head-first into a wall. Throughout this sequence, the man is obviously a live human being. However, a fraction of a second before he impacts the wall, he transforms into a life-size rubber dummy before our eyes, in mid-frame, without any obvious camera cut. This demonstrates the complexity of the scene - it is a digitally-edited collage of action sequences almost seamlessly strung together into what appears to be one long traveling shot.
Revealing mistake: When Four injects Tris with the serum before taking the test for the first time, it is very apparent the syringe is not injected into Tris' neck. The tip of the syringe is merely just touching the skin of Tris' neck and the syringe is shown moving around her neck. (01:07:30)
Revealing mistake: At the end of the movie, it's pouring rain but the 2 survivors aren't getting wet at all.
Revealing mistake: When the girl gets her head cut off with the barbed wire, when her body falls to the ground, her feet bounce around like rubber.
Revealing mistake: When Thomas is running through the blades to rejoin the other runner, as they run into each other it is a CGI background. (01:08:50)
Revealing mistake: When the camera pans across John's family sitting on a pew, there is a few to several inches between each body. The almost-still frame closeup view from John's end shows the bodies cramming/overlapping and the first four are blurring. (00:11:03)
Revealing mistake: Late on in the film; Arnie and the female officer kick in the door to one of his teams house. Unfortunately Arnie is in his 70s now and not as agile as he used to be, the door was open and simply pushed hard. Look at the door, it has no damage and neither does the frame. Also, the door barely opens past a hard push. As tactically trained operatives they would not have pushed the door if it was ajar either, they would have opened it slowly to avoid startling anyone inside and warning them.
Revealing mistake: It is obvious that the actor, Ellar Coltrane, is watching and waiting for the cue for "Mason" to start drinking from his can of beer at the pool hall. (02:03:44)
Revealing mistake: In the beginning of the storm, a trashcan is blown down the street, by the wind. Most of the leaves, lying in the road, are not moving though. (01:28:05)
Revealing mistake: In the airplane fight, heavy objects (and people) get sucked out of the door once the cabin is depressurizing, but the cables and the mask tubes on Richard's side stay softly curled and unmoving throughout the scene. (00:06:10)
Revealing mistake: When Millie is being carried away, her head remains completely upright as though under her own control. If she was dead her head would hang back.
Revealing mistake: Tommy picks up a chair and breaks it on a desk, but the chair breaks just before contact. (01:25:30)
Revealing mistake: In the POV shot from Thomas, capturing Bill and Ben puffing away from the water tower, Thomas seems to be off-centered from the tracks, making it seem like he is derailed.
Revealing mistake: During the battle of Dale, Bard confronts Alfrid, who is dressed as a woman and is trying to escape with looted gold. During the confrontation a troll climbs over the parapet and is killed by Bard. As the troll falls, Alfrid also falls. When he lands, the ground near his hand ripples like fabric covered in sand.
Revealing mistake: Tortured by the demonic voices in his head, Michael King goes into a self-mutilating frenzy with a kitchen knife, except that he squeezes the handle of the bleeding-knife prop a bit too hard and it squirts fake blood horizontally across his chest.
Revealing mistake: At the very start, a German tank has Russian markings instead of the German. (00:01:50)
Revealing mistake: Jim parts his hair on the left side. The stacks of his books on display in the hallway include a photo of him with his hair parted on the right side, but otherwise looking the same. Hair that is persistently parted on one side will not easily part on the other side and lay across the head in the same way. (The image was reversed). (00:25:20)
Revealing mistake: Tanner Boatwright was used as a leg double for Augustus. In the part of the sex scene where they shoot from the feet up, you can see that the amputated thigh is thinner and has a slightly different colored tone of leg hair than Ansel's actual leg. (01:05:25)