hah, good find, I didn't notice that in the show. (Paintings, right?)
If you read the directors interviews? The guy likes to comment on fiction, as much as write fiction (And he uses writing to comment.)....So this is going to be trolling in one way or another. Either he's just tossing shit like that, and the devil nets and Hart's dolls/spirals out there to watch people who over-analyze add their own off the wall narratives, only to shut them out at the end without explaining---or he's going to pull some stupid troll like "zomg Hart is the killer or "hart's wife is!"...or something dumb.
It feels like his main goal in writing is to show how much power people who make the stories society lives by, have over society; this is why I could see him doing some ham fisted shit at the end or tossing this stuff out there with no real thread to sew it together (it's literally just there to drive people nuts.)
I hope it just wraps up without some obtuse twist, though. I'd be far less annoyed if these little "clues" just never got explained than if he tried to do it with some mega twist.