Continuity mistake: When the Jeep stops in Priceton, we can see its on a single land road. However once it starts to accelerate in the next shot to ram the tree at the intersection, it is now a forked road.
Continuity mistake: When the woman shows the video at the Filbert restaurant of the man being mutilated by the lions, the position of her hand holding the iPod changes between the front and back shots.
Continuity mistake: During the scene when less than a half dozen of them are running through the field before they head towards the model home, the one girl (Mara Hobel) who was running in the field with them disappears when the wind harmlessly catches up with them.
Continuity mistake: When the train first leaves Philly heading to Harrisburg, there are 4 cars pulling out and 5 on the overhead shot. Also when pulling out of Philly it is a diesel engine and the overhead is electric.