Periodically, we see beyond the wall, where it appears to be heavily forested just beyond the wall and a distance beyond. However, once past the wall, the group starts with a cliff down and then it is completely barren, with completely different weather conditions (frequent red rain).
In a scene where Four is talking to Tris, he puts his hand on her throat. But when the camera angle changes to look at Tris talking back his hand is on her shoulder. His hand shifts back and forth during the entire scene.
While eating together, Tris and Four are having a heated discussion concerning the Bureau's intentions. Tris' right shoulder bra strap appears initially in the scene and disappears for the remainder. In the same scene wisps of her hair, on the left side of her head is curled and then straighter and it goes back and forth many times. It is obvious that the scene has been shot on at least two different occasions.
When Four tells Tris that he found out that he's damaged he is sitting at a table eating. On the table there are two small bowls that look empty throughout the scene, however, when Tris gets up to leave and pulls her hand away from Four's, in the close up shot one bowl is now filled with food, and both bowls are in different positions on the table.
When Four manages to get upstairs, he tries to tell Tris of the bureau's true intentions and that she is being lied to. But she rejects his ideas and joins David in the elevator. You then see Four being escorted away toward the door. But as Tris and David's elevator begins to go up, you see them looking down at Four, who is looking up at them, from the same spot he was in when he was pleading with Tris.
At the point where Tris comes back out after stopping the flow of the gas, she has 2 of her drones on her back. 20 seconds later when she is walking out of the room, you can clearly see that she now has all 3 drones on her back.
When Four is trying to get Tris to return to Chicago with him, when he says "You're coming with me" he has his hand on her neck, but in the next shot when Tris says "I have to go" his hand is on her shoulder.
When 4 is taken to be (killed) the (head) guard goes to talk to him while flying... when he approaches his hair is shaven around the sides, when the camera faces him head on his hair is longer at the sides, when the camera faces a different angle his hair is shaven again.
When Tris and Four repel down the wall to run to the generator, they do not disconnect from the grappling wire nor does Four reattach his wire. While they are running there is no wire attached to them.
When Four is being taken from the tower, a fight breaks out in which he fires into the cockpit. The pilot on the right is either killed or unconscious, but at 1:12 you can clearly see his head moving around in the background, but when the go back to a close up of the cockpit to show the ground through the front glass, the pilot is slumped over again.
Nita explains to Four that the left hand controls the drones, yet later in the film Christina controls her drones with her right hand. Four, being right-handed, was wearing the drone control glove on his left hand, which is why Nita told him to use that hand. Christina is left-handed and wore the glove on her right hand.
After Shailene Woodley gets purification shower and fits into new outfit her tattoo reveals on the right side of collar bone whereas it is originally on the left. This happens during holographic presentation scene.