Continuity mistake: In the beginning scene where Brian is telling his sad story to the bartender at the bar, he pulls out a picture of him, Jacob, and Anna. Then the movie progresses to a sequence of their childhood, and then focuses back in on the picture. The two photos are different. One is a close up of the three kids' heads; the other is taken from much farther away.
Continuity mistake: The two men are talking on the street while waiting to cross the street. Watch the kids around them. The two girls on the left bottom look right at the camera. Another girl towards the mid-right, is just mumbling out words. If you look at her lips, you can tell that those are not words.