As Robert Kitner fires his machine gun from the rooftop, the camera shows he only has about 5 rounds left, yet he fires about 40 more.
About 15 minutes into the movie, when Jed and the guys escape in the pickup truck, they go off-road. The cat-back exhaust is visibly missing. When they get back on the road, the exhaust is suddenly hanging down and dragging on the ground. In the next shot the exhaust is gone again.
After Matt yells to Peter in the car to follow them and they are driving through the park, Peter's car pulls behind the truck. In the next shot the black Jeep is behind the truck. Then Peter's car is behind the truck again, and then the Jeep is behind the truck.
When the Wolverines are about to ambush the Koreans at their town rally, Daryl looks down the scope on his AK74 and the lenses cap on the back of the scope is down, blocking Daryl's view of both his dad, and his true target.
The depiction of the North Koreans is inaccurate. The vertical banners are missing the blue stripes of the North Korean flag. The hammer, sickle, and writing brush symbol is used by the army even though it is the emblem of the ruling Workers Party of Korea. Portraits of Kim Il Sung and Kim Jong Il, which are everywhere in North Korea, are nowhere to be seen. The uniforms are not standard North Korean uniforms, and Captain Cho never wears any headgear.
The police car that Tom Eckert is driving is supposed to be a Spokane Police car, however, it is painted in the colors and style of a Spokane Valley Police car.
When Matt is offered a lift on the helicopter by Tanner at the end of the movie, the machine gunner on the helicopter is a dummy.
In the deer hunting scene as they observe the lone whitetail buck, the deer has 2 points and a brow tine on his right side and has a total of 6 points. After the buck is killed, you can see the right side of the rack and now he has 4 points and a brow tine on the right and is probably a 10 pointer.
There are no external controls on the side of the Intratec Tec-9 submachine gun that Chris Hemsworth could adjust in order to make the weapon more accurate.
When Captain Cho gets into his vehicle at the beginning of the first chase scene, he closes the door with an audible thunk. The door is clearly a standard HMMWV soft door with a plastic door handle, and would not make such a sound.
The hills above Spokane in which the Wolverines hid is depicted as having deciduous trees. However, the forests in the hills near Spokane are filled with Ponderosa pines.
An EMP-style weapon fried all electronics, but they seem to have a working cell phone.
The North Koreans' invasion plan relies heavily on taking out U.S. Central Command. CENTCOM covers the Middle East. Its name derives from the fact that the Middle East is in the center between Europe and the Pacific, not because it is "centrally" vital to the U.S. military. U.S. Pacific Command would be responsible for North Korea, and U.S. Northern Command (named for North America) would be responsible for defense of the continental United States.
The North Koreans are supposed to have used an EMP device, this would have fried all the electronic ignition systems in the cars and buses. Military vehicles would be hardened against EMP.
On numerous occasions, the Wolverines have the opportunity to kill Captain Cho, yet they don't. The most noticeable one is right after they start their guerrilla tactics and Cho shows up and is called by North Korean Central Command. They could have sniped him pretty easily.
Humvees feature prominently as one of the North Koreans main modes of transport. However, North Korea doesn't operate the Humvee in their military forces.