It is not been known from yesterday that Mark Hamill is a true Star Wars legend. Luke Skywalker is, along with Darth Vader and Han Solo, one of the most recognizable names from the original trilogy. The actor even took part in the newest movies directed by J.J. Abrams and Rian Johnson, and played a very important role in The Last Jedi.
Luke Skywalker was not the only character that Hamill played in the course of those decades. The actor also has an amazing dubbing background (he is the voice of the animated Joker). In The Rise of Skywalker he played an alien named Boolio and had a bit more work to do with the well-known and popular animated series Star Wars: The Clone Wars, where he played the Sith Lord Darth Bane.
He also received his five minutes (though five seconds would be better in this case) in Jon Favreau's The Mandalorian, but most viewers did not notice this cameo, despite Mark's recognizable voice. This performance took place in the fifth episode of the series, titled The Gunslinger. It was a very nostalgic episode as the action took place on Tatooine, in the legendary Mos Eisley cantina. The main surprise was that it was now run by droids.
It's one of those charming tincans that Mark Hamill was playing. He even enters into a dialogue with the Mandalorian to politely draw his attention to the fact that the bounty hunter guild no longer functions on this planet.
There are many, many more easter eggs in this title, and vigilant fans keep discovering them. A lot of material for analysis will certainly come with the second season, which is to be released in October, this year on Disney+.