Factual error: When the zombies are about to over-run the house, one of the ravers sacrifices himself by shooting a keg of gunpowder to blow up the building. The problem is that gunpowder is not an impact explosive, you could shoot that keg all day and all it would do is put holes in it. Just shooting it would not cause an explosion.
Factual error: When the Chinese enter the Pink nightclub at the start and shoot everyone, they fire their weapons for a constant minute. Not one of them reloads their weapon once.
Factual error: The flight of the Hammer is a very bumpy one and more than once the ship is either upside down, on its side or straight up and down. The crew of the Hammer are completely unaffected by this and keep feeding ammunition to the guns. The Hammer's movements should be tossing them around since they aren't strapped to a chair like the pilots and the gunners are.
Factual error: In the scene where Wolverine is shot in the head the bullet stays in place until it falls off. Wolverine's skull is indestructible Adamantium (that doesn't even bend slightly from the impact), and an object that applies a certain amount of energy towards another object has the same energy applied to it in return. Considering the bullet's high speed (which means high energy) and the fact that there is not enough material around Wolverine's skull to absorb the bullet's energy, the bullet should have bounced right out.
Factual error: The 4-wheel-drive Meredith van Aken is using to pick up Jonathan Cold and the black box has got a German registration plate for Berlin. However there are no discrimination letters after the "B" for Berlin, but a 5 digit number starting with "3." Only police cars carry registration plates like this in Berlin.
Factual error: The Los Angeles Police Department no longer has an Internal Affairs division. The division is known as the Bureau of Professional Standards and is subject to civilian oversight - meaning the roughshod treatment Gavilan was receiving at their hands would have been checked at minimum by a civilian review board. That having been said, Gavilan's behavior should have gotten him in trouble regardless of whether or not someone in the department was out to get him.