When Eugene climbs the tower, he holds his arms out level with his shoulders in the wide reverse shot. But in the closer shot from the front, his arms are lower and bent.
When Eugene threatens to shoot himself in the head, the gun barrel is pressed firmly against his temple. But in the reverse shots, there is a gap of a couple of inches between the gun barrel and his head.
When the hospital loses power and the generator engages, the film shows this taking less than 1 second. In reality, the generator has to start, come up to speed, then the transfer switch has to transfer power from the power grid to the generator. This process takes 4 to 7 seconds in most situations, and hospitals are accustomed to this short delay.
When Eugene shoots the guy who was on top of his wife, he then holds the gun to his head. The pistol is a 9mm automatic and had just been fired, so the hammer would be in the cocked position, ready to fire as a single-action. The mistake is that the hammer is down while the gun is to head, which would not occur unless Eugene had manually lowered the hammer.
In several scenes, mountains are seen in the background. The characters are working around hills and tall green forests. However, the area east of Lubbock, TX which is shown on the work map is very flat and only some areas with low, rolling hills and no lush forests.