Continuity mistake: Throughout the movie, the boy goes through a few hairstyles, and he goes back and forth from small and young looking, to taller and more mature looking.
Continuity mistake: When Rick kills Ray it is raining out, but when he pulls into the warehouse his truck is completely dry.
Continuity mistake: When the mother finds her husband cleaning his burn wounds she goes to get her son, which is on the computer in his room. A second later, the boy is back in his room hiding from the husband and the computer is gone.
Continuity mistake: When Danny looks outside his room after someone tries to open his door, the light is on. He closes the door and then Rick threatens him. When Rick walks outside Danny's room, the light is off.
Continuity mistake: When Rick, Ray and Danny are out on the sailboat Danny is sitting near the bow trailing his leg in the water. His Dad yells at him and as the shot changes to a more distant view of the sailboat, Danny is nowhere to be seen.