Whoever sent this request in is obviously very familiar with what Fridman does. He knows that the genius will find a way to twist any request he makes, so he's just left things open to his judgment. What we have as a result is a photo of a group of men, and an invitation to do anything with it that Fridman wishes to do. Rather than go crazy, Fridman has taken the subtle approach.
This might be the most fiendishly difficult 'spot the difference' competition we've ever encountered. There are allegedly thirteen differences between the image on the left, and the image on the right. We spotted a few of them, but we got stuck very quickly. As a starting point, look at their feet and their hands, which will get you a couple of them. Are there really thirteen to find, or are we being trolled? How many can you see?