When the surviving shuttle crew finally get the moon crawler out of the shuttle, and are about to begin mining, pay very close attention to the asteroid itself. In the beginning scene sequences, the ground in front of the crawler is a typical blasted asteroid surface. But later, in one scene only, the film editors forgot to cut out the grass. The entire ground in this scene in front of the crawler is covered in grass. Perhaps they found life in outer space after all: It was just astro-turf!