Continuity mistake: As Tony is first flying up with his Iron Man armor, the box opens in the tunnel and he flies out of it. In the tunnel there are two large orange light lines running along with it. They are not at opposite ends of the tunnel, one being at about 12 o clock, the other being at about 8. When the shot changes, suddenly the lines are at opposite ends, 12 and 6 o clock.
Picture added by Quantom X