Other mistake: When Clyne is making the new weapons to defeat the spectrals, at one point he uses a white, hot glue gun like an electric drill, even with added drill sound effects.
Other mistake: Mark is driving down the road in an old pickup truck. An inside shot shows the truck is bouncing and the scenery is passing by the left side of the truck. But the ignition switch is in the off position. A few shots later he pulls up to the research facility and the ignition is now on, which he turns off.
Continuity mistake: Gen. Orland is shown in one shot having a US Army name tape on his left side. A few shots later, it is on the left.
