As the Armorer fires up the forge and crafts the helmet, a familiar sigil can be seen hanging on the wall of the cave. This sigil is the Beskar-crafted skull of the Mythosaur. In Star Wars lore, the Mythosaurs were a race of gigantic creatures native to Mandalore. They were eventually driven to extinction by Mandalore the First, before becoming known as the symbol of Mand'alor - the ruler of the Mandalorians - the planet Mandalore, and the people of Mandalore themselves.
The Anzellan technicians were voiced by Shirley Henderson, who also provided the voice of the fellow Anzellan Babu Frik in Star Wars: Episode IX - The Rise of Skywalker (2019). All of her production sounds she had recorded for Babu Frik were preserved, and some of the voice clips that didn't make it into the film were used in this episode.
The leader of the pirate crew is a Nikto named Vane, while there's also a Weequay. There is also a Trandoshan, a Klatooinian, and a Quarren - all races associated with pirates, smugglers, and bounty hunters in the past.
The shard which Din presents to the Armorer features a Mando'a inscription. This inscription actually translates into a passage from Exodus 10:5-6, KJV in the Bible. The passage references the Jewish enslavement by the Egyptians, who are eventually led to the Promised Land by Moses.
Greef Karga explains Moff Gideon is facing a New Republic war tribunal for his crimes. The New Republic tribunal is the main judiciary service of the galaxy's new organization.