Revealing mistake: If you get a slow motion bullet cam shot on a zombie wearing a helmet or hat, and it's a head shot, you can see the hat fly off when the bullet hits, but often you will see the layers of the hat pass through the zombie's head with no collision.
Bug: If your computer or connection lags too much on co-op mode, sometimes you will lose connection and be removed from the game back to the menu. Sometimes though, when the connection is lost, the screen just turns black with the spinning Pentagram at the bottom as a loading screen, but it just stays there. You are stuck. You have to close the game down and restart it.
Bug: Cathedral of Resurrection: In the actual cathedral where you fight the boss, upon entering the room, you will likely hear sounds that sound similar to how the bones of a killed skeleton sound. But none are yet present. Looking around, especially on the bridge, you will find that the movable debris is not placed correctly. Like large bricks or boulders halfway in the ground. And this sound is the them suddenly getting popped up out of the ground by the game engine as the physics finally collide. It makes for an added scary factor the the horror game of objects jumping around on their own. But this is in fact a glitch not intended to be in the game.
Other mistake: Single Player Mode: When the player gets off a good shot of multiple kills with one bullet, the slow motion bullet cam will follow the bullet through each zombie hit. This is supposed to slow down all the game play for the bullet cam. However some zombies will resurrect themselves, showing a glowing orange pentagram around them, and stand back up after being killed once. It takes them a moment to resurrect. But this does not slow down with the rest of the game as it should during a bullet cam moment. And often times when a multi-kill bullet is passing though other zombies, you can see a zombie previously hit by that bullet suddenly get the orange pentagram around it and erect itself again before it even has time to react to the first bullet due to slow motion by bullet cam.
Bug: Cathedral of Resurrection: Right after the fourth Safe Room, players will find a spot between that building and the next, where skeletons spawn. If a player goes to the left of the next building instead of going inside, it is a dead end that is burning. However there is debris in the way the prevents the player from getting close to the fire. However, if you stand right next to this debris, the player will act like they are being burned and begin to get wounded, despite there being no fire around them.
Bug: It's rare, but sometimes after knocking down a skeleton that doesn't die, it will completely stop moving and just lay on the ground, but with its lungs and heart still in tact and visible. The game thinks the skeleton is still alive, but the players will be completely unable to do anything to it. No amount of shooting it or blowing it up will destroy its lungs and heart to kill it, and it won't get back up. Depending on where in the mission this happens, it can force players to have to restart. Like if it is at a point in the game where in order to progress to the next spot, all enemies must be destroyed. This skeleton that can't die or do anything prevents progress at those points. But this is a rare glitch.
Audio problem: After killing a skeleton, its bones will fall to the ground and rattle around making loud noise. However the radgoll and physics for this was never finished correctly, and thus even after the bones stop moving, they continue to make the loud rattle noises until they vanish, which takes a while. And the bones tend not to stop moving either. This glitch is also present in NZA2.
Revealing mistake: Cathedral of Resurrection: There is a room with a radio before the third Safe Room where the radio is constantly saying "All hope is lost! Lord... Please save our souls." If you look at the wall to the right of the desk with the radio, you can see separation from the wall to the wall next to it, and the floor, where light is shining through from the other side. But it's not supposed to do that.
Bug: Cathedral of Resurrection: Outside of the Second Safe room, there is a drop area inaccessible to players. But if you look down into that spot, you will see on the far side the texture of the ground is messed up, flashing and blinking. Moving around causes it to appear to be levitating.
Bug: Cathedral of Resurrection: The second Safe Room has an open wall where you can stand and shoot out at the zombies in the next area safely before you go there, lessening the their ranks before the bigger horde comes. Though sometimes if a player gets too close to the edge, a glitch happens in just the right spot where he will fall out of the safe room, and off the map. Going under the game into just space and will die.
Bug: Cathedral of Resurrection: Before you get to the third Safe Room, there is a burring building you must go through after fighting off another horde of zombies. Skeletons will spawn in the room just before the Safe Room. If you quickly run over to the broken wall right next to the safe room, you will see a poster on the wall reading Flakwaffe showing two Germain Soldiers along side another poster. If you stand in that spot by the wall, the skeletons can't get to you. Not knowing what to do, the skeletons go to the other side of the wall trying to get you through the wall.
Continuity mistake: During the events of 'City of Ashes', you can sleep a little in the survivors' headquarters on a designated bed, that triggers a short, surreal nightmare-sequence. Now, if you use your guns or explosives within the dream, the ammo loss will be present even after your character wakes up - it makes no sense.
Other mistake: In 'Tower of Hellfire', the headlights of the trucks parked outside of the fortress form no shadow of characters, like they normally do.
