People have been doing photo analysis for a long long time, and have gotten quite good at doing geolocation based on details in the background that the average viewer ignores. Spy agencies are especially good at it. There's many a spy movie that offers glimpses into this, but The Good Shepard comes to mind.
Even as a joking kind of thing, the opposite has been done. There's a famous exchange between Neil DeGrasse Tyson and James Cameron about how the sky in the movie Titanic was wrong. Cameron accepted the challenge, and on a remastered version had the sky replaced to be historically accurate.
It's a game to some people. It's a challenge. It's self rewarding in this case, sometimes there might be actual rewards of sorts. Hell, I've spent more hours than I'd like to admit on Nasa's website where you use the images taken by the astronauts on the space station and align them on the globe. I got nothing out of it other than being entertained by the challenge, learned about some new places on the globe when I would try to find out why that place was interesting to the astronaut to snap that particular image, etc.