During the opening credits a gun is fired in a closeup. The muzzle fire is visible, but the gun never cocks back.
(at around 37 mins) A woman in the background is typing on her laptop while it is showing a login screen.
When Alex is shot, a trail of digitized blood covers the column he's standing behind. As the actor falls back and slides down the column to the floor, the lower half of the trail briefly blends in with his face.