1. Several pictures that anybody with even a little photo editing experience could tell (having cross hairs behind objects in the picture)
2. The very intense radiation that they would never make it through.
3. How heavily guarded area 51 is...what could they possibly be hiding there?
4. The flag waving in the atmosphereless space.
5. No blast crator underneath the lunar lander.
6. No stars in any of the pictures.

Want me to keep going?