Iron Forged in Fire: Part One - S1-E1
Continuity mistake: As Tony is trying to stop the train by pushing on it with the Iron Man suit, you see the fingers of his right hand are outstretched fully and his hand flat against the door, with his pinkie right on the line between the black door and white wall of the train. It then cuts to a close up of his hand and suddenly his fingers are curled and his pinkie not anywhere close to the white part of the train. (00:19:45)