Go to the section where the drop ship is about to leave the main ship. Look carefully at the red circle/picture painted on the side of the ship, just to the left of the pilot's window. Look which way the parrot (or whatever it is; it looks like a parrot to me) is facing. Fast forward to where the drop ship is now on the planet's surface and the Marines are leaving the ship. The figure is now facing the other way! (Look which way its feet are facing.)