There are some other faces that could have details to nitpick on, but I feel like those wouldn’t get fixed as quickly as these, and I’m just happy to see old classic faces get fixed up a bit.
artefacts like this are probably from the software they were drawn in (presumably white background with smoothed out brushes and then cut out using a magic wand tool) as seen in the example below
The :-[, Mysterious and Thinking faces also have really bad white pixels on them. The Friendly Eviscerator and its limited counterpart have a similar problem to the Moonstruck faces, with one of its teeth being slightly outside the mouth.