Revealing mistake: In the beginning, during the riot outbreak, there is a scene with a soldier being pulled down from climbing a fence. In the next shot as the crowd is pushing forward, you can see a concrete road block tip over. If you look closely at the bottom of the block, you can see that it's not a real concrete block, but a prop made of wood planks and grey painted rubber.
Revealing mistake: In the final shootout scene, when Rambo takes over the truck mounted machine gun, he shoots the driver, whose blood splatters a lot over the metal guards on the gun. If the blood splattered that much on the guards, it should be all over the interior of the truck which is revealed to only have blood on the floor - none all over the dash or doors.
Revealing mistake: In the roof top chase between Bond and Mitchell, it is obvious that both characters are wearing black running shoes, when in the previous scene both wore smart black suit shoes.
Revealing mistake: When the Hulk walks through the stream, the water doesn't react to his feet. (00:59:20)
Revealing mistake: As Terry and Martine approach Le Sac shop, you can see reflections in the window of that shop of trees. This gives away the fact this was a custom built set (as shown in the extras) and not the real location in London. (00:20:05)
Revealing mistake: Right before Rick grabs the half of the broken dagger, he is starting to stand up, only to be kicked by the Dragon Emperor and slide back about 8 feet. As he starts to stand again, you can see that the background is exactly the same as the first time he tried to stand up - meaning that both moments were taken from the same shot, despite the fact that the background should now be different.
Revealing mistake: Some of the shots involving the terrorists firing at the prototype suit are "flipped" duplicates of other shots. In the scene where he first emerges from the cave, several of the terrorists are firing M4-type rifles with the ejection port on the LEFT side of the rifle. In reality, except for a few specially made versions, all M4-types eject spent brass through an ejection port on the right. Later in the scene, this shot is repeated, but with the proper orientation.
Revealing mistake: When Ami's chest is being drilled by the "drill-bra" at the end of the movie, you can see blood flowing from her chest, obviously because of the damage the drills are causing her. Yet, later, you can see absolutely no cuts or marks on her breasts or upper chest, where the drills were penetrating her skin. The skin is simply soaked with blood.
Revealing mistake: At the beginning, Griffin sits back on his chair after getting information about the first hacker who attacked their computer. He's about to put his hand on a trackball, and you can see for a second a badly covered Logitech's logo (they have left some characteristic details); the model is a Logitech TrackMan.
Revealing mistake: When the Dreadnought blows up the Buick Riviera, it's plain to see there is no engine or transmission in the car when it flips up and forward.
Revealing mistake: When the guys are seen piloting the UAV's, they are using Saitek X52 Pro joysticks. These are commercially available controllers for Microsoft Flight Simulator. These were obviously used as props. Even if the army did use these for some reason, they weren't turned on in the movie (the buttons glow green when turned on).