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Iron Forged in Fire: Part One - S1-E1
Continuity mistake: When Tony and Rhodey first go to Tony’s secret lab, there are numbers on doors around a circular wall in the lab. When they go in, the number 2 is behind the spot with the chamber holding the Iron Man armor. When Tony lowers the chamber holding the armor, the walls spin to have the number 4 behind that spot. But when Tony gets in the armor and the chamber goes up, the number 2 is now there again. (00:14:35 - 00:15:55)