Orville Peck, a masked, queer country artist is playing when Angela comes in to tell Topher that his "uncle" Judd's dead.
The man who is talking in the heritage/genealogy kiosk is
Henry Louis Gates Jr.
There's a theory that supposes Doctor Manhattan has Ozymandias/Blonde Man in a Martian prison. A listener also supposes that Ozy'z anniversaries are literal, and that so far we've been watching his storyline through flashbacks. The second candle, the change in the watch.
Bass Reeves, irl, was hired for his martial prowess as well as knowing indigenous languages --
tying into the episode's eponymous painting. Judd's grandfather, in the photo, Dixon T Crawford, is an inverse name of
Thomas Dixon, not too far of a reach, even if it's only a trivial reference, considering the cloak.
And then, I'll offer up that researching Hong Chau's character name brings up
some interesting history of its own.