Iron Forged in Fire: Part One - S1-E1
Continuity mistake: Right in the beginning, Tony is welding the Iron Man suit and is wearing the protective welding mask. In a close up, the mask is illuminated orange from the sparks and heat being close to the welder. It cuts to a different angle before he turns the welder off, and suddenly the mask is illuminated blue from the lights above it. (00:00:15)