As Conrad roots through the shambles of the ship just after crashing into Mars, a boom mic shadow is visible. But, this is not a boom mic shadow. It's the shadow of a piece of the interior ship, swinging back and forth. Although the object is not seen, you can tell it's not a boom mic because it swings. It's an object on a rope or cord, not on a boom, like a mic would be.
When everyone enters the house tape can be seen on the floor so the actors can hit their mark.
When Conrad walks into the living room after banging on the front door, the shadow of the boom mic and its operator are clearly seen.