I also found them easily recognizable due to the random artifacts.
My favorites are the nonsense ones that kinda look like other elements in the art but have no connection to reality regardless of how abstract or impressionistic it's supposed to be.
A couple of these containing buildings had things that looked like roofs, awnings, doors, etc. in the middle of a lake or jutting out from a wall or obscuring another feature just like it.
Not that AI can't generate images which would be indistinguishable.