Job interview question: what is wrong with this picture?

Earth and Moon seen from 1 billion miles away:

What is wrong with this picture?

Answer

There is no way this picture is taken from 1 billion miles away. Or if it is, this is a huge zoom in, maybe by a factor 500, on the original NASA picture.  First, 1 billion miles is 5,000 times the distance between Earth and moon. So Earth and moon should appear as one single dot and be indistinguishable. Second, could you see a celestial body the size of Earth 1 billion miles away from Earth, from your home? No way: Saturn is about 1 billion miles away from Earth (at its closest), far bigger than Earth, and never visible with the naked eye.

In addition, there should be thousands of stars, much more shiny than Earth, visible in the picture. Where are all these stars??