Continuity mistake: When Alex is in the evidence room she has her arms folded in one shot and her hand instantly on the table in the next.
Continuity mistake: Alex rolls down a hill after falling off a tree and hits her head on a rock. The rock isn't there when the camera switches perspective.
Factual error: The scene where The Guardian leaves the bank is supposedly filmed in London. In the proceeding chase / fight the location doesn't appear to be the UK at all. The traffic lights are not British. Cars are also driving on the wrong side of the road. (00:23:35 - 00:26:30)
The Guardian - S1-E5
Trivia: Stan Lee makes a cameo describing the Division's operative as being like a superhero. (00:07:00)