Continuity mistake: When Pepper is changing out Stark's arc reactor chest piece, in one shot she pushes the device in, then in the next shot she pushes it in again.
Continuity mistake: In the scene where Tony Stark is in the cave building his mini arc reactor He tells the Dr. what it is, then the scene cuts to Tony laying down the papers for the Mark 1 and you can see the glow of the arc reactor in his chest. Immediately after that the scene cuts to the terrorists tv monitor and seeing the Dr. putting in the new arc reactor.
Factual error: A tank's main gun could not blast Iron Man out of the sky, as depicted in this film, and the "lucky shot" theory holds no water. In military history, there are only a couple of instances of tanks using their main guns to shoot down aircraft by chance, and those involved tanks repeatedly firing their main guns on known flight paths until an aircraft literally ran into a tank round. However, in this movie, Iron Man comes out of nowhere on no known flight path, he's not recognizable as an aircraft, he's traveling at hundreds of miles per hour, and he's only airborne for about 4 seconds before he's hit with a tank round. The tank gunner could not possibly identify Iron Man as a new target, elevate the main gun, track him and fire in 4 seconds. Modern tanks do not have the ability to acquire and track fast-moving targets with the main gun, nevermind fast-moving aerial targets.Charles Austin Miller
Audio problem: When Pepper runs out of the Stark Industries building and says "Obadiah, he's gone insane", her lips don't match with her mouth.
Audio problem: When Tony is breaking down the test run to Jarvis, a note-perfect transcript of what they say appears on the screen in the right corner. But when Jarvis says "Shall I render using proposed specifications?" the screen says "Shall I render utilizing proposed specifications?" Also the words that Tony says appear on screen before he says them. (01:06:25)Friso94