I bet Getty or whoever has some sort of face recognition like they have on these photo storage sites and they just matched them up.
I had the same reaction; some I could see whereas others had me going "Huh? No way!" There was one photo for Pulitzer and someone who was supposed to look like him, but I thought the resemblance was minimal at best. I thought John Lennon was more of a match facially for Pulitzer. I have to say though I thought more looked unalike than alike and tyhey probably could've found more who actually did look alike. It was a fun piece though.