Plot hole: At the angle of descent and the speed it was traveling (still burning from reentry even), when the space shuttle crashed in the opening of the film, it would not have left much of anything behind. The kinetic explosion that would have resulted would have downed the forest around it for a good distance leaving a crater, and the clean up crews would have been lucky to find any piece of the ship itself still intact bigger than a football. Much less been able to find any discernible remains of the crew. Yet bodies were being taken out in still relatively good condition. And probably most unbelievable is that the glass containers holding the Symbiotes were not even broken.