If the frames-per-second is not locked at 60, NPCs may start 'hopping'.
Some guns eject on the left side. Most guns eject on the right since most users are right-handed.
Some of the weapons have incorrect loading animations.
Vehicles should not explode, given that gasoline is volatile but not explosive.
The Springfield rifle's bolt is on the wrong side; bolt action rifles are designed so that the hand that fires the weapon must draw the bolt, for the center of gravity is held by the other hand and the other hand cannot draw the bolt while holding the rifle.
Punctuation mistakes in in-game text.
Chickadees can be heard, even though chickadees cannot be found in Africa.
In spite of there being a bus system, there is no bus service to the airport.
Hector Vorhees holds his phone normally while speaking on it, even though he has a hands-free device constantly plugged in his ear and clipped on his shirt.
If an attack on the police chief fails, the convoy simply goes back to the same circular route which put it in peril.