Goofs

In the beginning of the film, a child rolls a 3 on a die, so it's on top. In the next shot, the 3 is on the side of the die, facing the camera, although the old man in the scene could have moved it (his hand nears the die). However, in the next shot, same camera angle but tighter, the die now has 2 and 4 facing the camera (so the 6 is on top). In the following shot, the 3 is back on top while a 5 is now where the 4 was in the previous shot, all while the old man is loading a gun.

Jacob overstates the amount of blood in the human body, especially for a relatively slender woman like Diane. A man of 'average' size will have about five litres of blood in his body, Diane certainly has less.