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.

Iron Man (2008)
1 revealing mistake
Directed by: Jon Favreau
Starring: Jeff Bridges, Robert Downey Jr., Gwyneth Paltrow, Terrence Howard, Leslie Bibb
Other mistake: When Iron Man and Iron Monger are fighting, Iron Man catches the SUV, and you can see the family inside the car. Although the car is completely vertical, the hair of the people in the car seems to defy gravity.
[Pepper catches him in Iron Man suit.]
Virginia 'Pepper' Potts: What's going on here?
Tony Stark: Let's face it, this is not the worst thing you've ever caught me doing.
Question: After Obadiah Stane steals Stark's new reactor, how does the old one he reinstalled run out of power? It's a reactor: it generates power.
Answer: Yes it does create electric energy, but because of the laws of physics, energy can't just be created, it must be converted from another type of energy (chemical in this case, I assume), so Tony added a ring of palladium to the reactor while building it, which causes a chemical reaction inside to generate electric energy, so anyways, if the chemical energy inside the reactor is taken way so is the ability of the reactor to produce electric energy. Tony solves this in pt. 2 with switchable cores.
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Chosen answer: It was basically a prototype made from, to quote Stane, "a box of scraps." It was not strong enough to last, especially when it came to powering Tony's high tech armor armor upgrades.
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