Why is it that from these 'trips', we never see stars in the background?
That's apparently one reason why some people believe the first moon landing was all staged and done in a studio.
When there is a full moon go outside and see how many stars you can find compared to a night when the moon is not out. You will see the difference. The stars are very faint and get washed out by the bright light of the moon.
The reason why no or very little stars can be seen is because of the Earth. The Earth, when lit by the Sun, is many thousands times brighter than the stars around it. As a result the Earth is so bright that it swamps out most if not all of the stars.
David Latchman, B.Sc. Physics, University of the West Indies You cannot even see stars in footage of sporting events at night. Further proof? Take a video or photo camera in the city and take a shot at the moon at night, see how many stars you can see there

(one of the first things I learned when starting my own Sky Photo project with my telescope)
Also, everybody should check one of my favorite astronomy sites to see how the "Moon landing hoax" theory is debunked
http://www.badastronomy.com/