Continuity mistake: When Jeanine looks at Tris' tattoo, there is hair covering the top of her ear. A few shots later, the hair covering her ear is suddenly behind her ear with only a strand of hair left over it. Then the hair is suddenly back to covering her ear as Jeanine goes to leave.
Continuity mistake: When the initiatives start playing the war games, Tris and Four take cover behind a shipping container. Four is first shown with his head in front of the container, but by the next shot as he says "Go" to Tris, his head is suddenly behind the container. This has nothing to do with the camera angles.