If we live in a simulation, proving it might be impossible. I’ve spent a lot of time thinking about how to find proof, and not a day goes by without me actively looking for it.

For me the most likely proofs will be either:

a) the simulation’s internal logic breaking down – some customisation that doesn’t ring true

or

b) an easter egg – some little conceit from the designers that nobody is supposed to find

If the designers figured we would never land on Mars, or ever create cameras good enough to see the planet close up, then perhaps they slipped in a serial number?

The original NASA pic is here:
http://mars.jpl.nasa.gov/msl-raw-images/msss/00907/mcam/0907MR0039700340501405C00_DXXX.jpg

I would prefer finding similar on Earth, where it can be visited and beyond dispute.