Patzer

The man who takes Dan's bag in the back of the grocery store, on his way out runs into Nicole, but he is no longer carrying Dan's bag.

When Steven enters the church, the inner doors remain open. In the subsequent long shot from near the altar, the doors are then closed.

Each time the guy fires the shotgun, he makes a forward lunge with the weapon. This might have been done to attempt showing recoil, but the timing is off and the motions still make no sense.

In the underground bunker/tunnel, Edward addresses the three as "Ladies, gentlemen." There is only one woman an the group he is addressing, therefore the address should be singular.

In the 102nd minute, a man tries to kill Nicole. He is shot from behind and drops his hand gun. Rather than retrieve his weapon, Katie reaches for a rifle leaning against the door behind him. It's unclear why this rifle was there.