2001: A Mario Odyssey

The location is called, I believe Bonneton. I saw that on the wiki.
 
That black and white area with the top hat theme gives me a strong Count Bleck vibe. I'm not going to set myself up for disappointment and say he might appear, but I hope there's some sort of callback or implication that he has a connection with that area.
 
Because top hats originated with Count Bleck.
 
Not top hats but depressing black-and-white areas combined with top hat themes and the fact that the thing that set off that game's plot is happening again here. Just seems like a good opportunity to throw a bone in that direction. I'm not pushing for anything major but even something subtle that shows they realize the similarities would be nice.

eh let's not dwell on it lol
 
I think it's more related to Cappy looking like a ghost wearing a hat when Mario first meets him, I find he has quite an evil face sometime, and makes me wonder if he will be involved in a plot twist near the end.
 
It's the land of dead hats.
 
Supreme Commander Fawful of the Digital Candy Troll Kingdom said:
So that means Mario's hat, after Bowser flattens it, goes to hat hell and Cappy possesses it?

Well when Cappy turns into Mario's hat he is holding a rag that looks like Mario's hat.