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 - chronological order
Directed by: Jon Favreau
Starring: Jeff Bridges, Robert Downey Jr., Gwyneth Paltrow, Terrence Howard, Leslie Bibb

Visible crew/equipment: In the extra footage after the credits, the reflection of the crew is visible in the picture frames around the apartment.
Virginia 'Pepper' Potts: The doctor has to look at you.
Tony Stark: I don't have to do anything. I've been in captivity for three months. There are two things I want to do. I want an American cheeseburger, and the other...
Virginia 'Pepper' Potts: That's enough of that.
Tony Stark: ...is not what you think. I want you to call for a press conference now.
Virginia 'Pepper' Potts: Call for a press conference? What on earth for?
Tony Stark: Yeah, Hogan, drive. Cheeseburger first.
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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