When Beth goes to the Intec site the second time, you can see her shirt is already ripped and blood stained before it touches the barb wire.
The pick up truck going off the bridge has two bodies in the back. As the truck goes off the bridge, no bodies are seen falling down with the truck.
At about the 1hr 15 minute as the mayor hybrid roach approaches Elizabeth she shoots off his left arm. It then cuts to a rear shot of the monster and both arms are still attached. Switching back to a front view, the arm is gone again.
At around 1 minute the amount of coffee in the cup changes between being half full to full and back to half full.
At around 14 minutes the dogs barking does not match with the dogs mouth.
In the first scene at the lighthouse, about 10 minutes in, as the sheriff is walking around his car, you can see the crew reflected in the car windows.
At 42 minutes in the dumpster scene a cameraman is crouched down in the right corner next to the dumpster.