Continuity mistake: In the shot where Holly is done injecting Anna with the syringe and stands up to shoot at Detective Loki, the syringe and two "medicine/poison" bottles are all close together next to Anna's hair. Next three shots showing the room far out with Holly getting shot and killed has the two bottles next to the edge of the rug and very far from Anna's hair, as well as the syringe which is slightly closer, but far away. The next shot of Loki picking up Anna has the syringe and bottles in their original position next to Anna's hair.
Factual error: In the scene where Hugh Jackman leaves the apartment where he is holding Alex and walks to a store to buy a bottle of liquor the liquor store has signs for beer in the window. The entire movie takes place in Pennsylvania and, which only has state owned liquor stores that do not advertise or sell beer.