Continuity mistake: When Tris is nearing the end of the zip line and she notices the other Dauntless initiatives already in the alleyway, there are only a couple of them on the ground from the POV shot of Tris. In a shot of the initiatives telling her to pull the brake, there's suddenly almost a dozen initiatives on the ground. (01:02:00)
Suggested correction: This isn't quite right. From the POV view there are quite a few people at the end of the line. Way more than a couple. Also, from the viewing angle most of them would be stood in front of the black wall (the background to the white cross). Divergents wear black. The background is black. It's at night, which makes things darker. It's at a distance, which makes things harder to see. So maybe it's understandable that from Tris' perspective the view wasn't quite as clear as it was from the ground.