The red square is centered on a shadow cast by a protrusion on a bright day under a high sun. You don’t see the rectangular shadow in the nocturnal photo because there is of course no sunlight beaming down. You can, however, look closely and discern there is a protrusion in the same position in the nocturnal picture, it just isn’t casting a sharp shadow.
That too.
I wondered about that. But the one photo has two stripes at the top of the RV, so there is that too.