Iron Forged in Fire: Part One - S1-E1
Continuity mistake: Right in the beginning, Tony is showing off his Iron Man armor to Rhodey and looks up after doing some welding. In the first shot, the welding mask is barely casting any shadows on his face, mostly towards his forehead. But then it cuts to a different angle and now the shadow comes all the way down past his eyes and on the bridge of his nose. (00:00:30)