Examples?
Almost any picture gives me that uneasy feeling that something doesn't add up, the light isn't quite right, the shadows don't appear natural or parallel, the comparative size of people doesn't quite work.
In your picture, it seems the shadow directions aren't quite parallel.
In another picture there is a little kid on a railing, with a background where the people look just a bit taller in comparison than would be natural. They don't cast shadows on the railing. The kid seems stabbed by the railing.
You know why people keep cats as pets? (Now that we're on the subject)? Because you hardly need to take care of them. What are the odds then that a cat is in a car which is snowed in? With a wolf-like dog on top that doesn't quite look like its on the prowl in the city, but more like a pose from on a lease that isn't there? And the cat, is it behind the window?
shadows of birds are different with what seems to be chromatic aberration, one seems a moving bird shadow, yet the water is perfectly frozen. Those shadows don't look natural.