There's three interesting effects here. The most apparent is the black and white pattern happening on the single line that is supposed to be colour $22.
The second that there is a 2 lines wide band of colour that should be a yellowish $28 but, as it turns out, is instead a somewhat flattering extra apricot colour that goes across the whole screen.
Thirdly, the bands are sort of inverted through blending (not how the upper band is slightly greener), compared to the emulation. They're probably all related.
I'm using my PAL system. I suppose these effects wouldn't appear on NTSC? It's a first for me. I guess it doesn't like a single horizontal line of colour so close to that bright sun. But i'm not too worried about it since there's supposed to be a sprite overlay on those rows that bends the attribute grid a little around the sun. Just curious what exact conditions causes it.
Edit: the single black-and white dots are easier to get since they're about differences on the same line.
Oh, and i'm setting bits R+G to achieve a morning light-looking master palette. But it doesn't matter.