Near the end, Prescott shoots one of his own men. The angle and entry point don't match the direction Prescott had to shoot from.
The bullet that Michael recovers from Bly's arm wound is in immaculate condition. Had it been fired into his arm and not torn out the other side then it would be deformed from impacting the bone.
In the voice over, Michael says using the Ethernet cable makes a good antenna. He actually cuts a power cable and uses the ground wire.