Mark Hamill’s character “The Scientist” that he will be the voice of has a Star Wars Easter Egg. Spotted on Reddit (which nothing seems to get past), was a die cast tie fighter toy that appears to be the eye of this particular Skeksis. Not necessarily the most subtle place to put an easter egg, but still.
Mark Hamill himself makes note of the reference in a tweet stating “A #StarWars toy embedded in my @darkcrystal character ‘The Scientist’?! This is news to me”.
Seems like the team was waiting to see if Hamill would notice. But of course the internet noticed first.