I’m guessing it’s just horrible, horrible jpg compression artifacts. There’s so little data other than black pixels there, the compression defaulted it all to pretty much just black. If you zoom in, you’ll see the same happening to shirt in the area between “lies steals it eats it” and “Dr. Stone will pay”. Both areas stand out if you mess with the levels in Photoshop, as they do not seem to contain any red / blue / green, just black and white. As for the top right corner: there doesn’t seem to be anything useful in there, except what looks like an exclamation mark to the right of the S (which is just barely visible in the original picture).
I could be wrong, of course. Feel free to check for yourselves.
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