3. Taungsday
That is possibly essentially the most obscure pull I’ve ever seen from a Star Wars factor. Taungsday–mentioned in a jokey “Mondays, am I proper?” sort of manner on this episode–is the third day of a Coruscant week, and this was established in a now-deleted weblog for Hyperspace subscribers in 2009. And no Star Wars character had ever talked about it in-universe earlier than this episode of The Mandalorian. There’s much more that means to this identify, although, than simply its bizarre origin.
The Taung, who’re an alien species native to Coruscant, don’t have any presence to talk of within the present Disney canon exterior of this one bit, however they had been essential to the galaxy’s historical past within the outdated Expanded Universe canon. Again then, the Taung lived on Coruscant earlier than it was a planet-wide metropolis, however they had been largely supplanted by people in historical instances earlier than the Galactic Republic was shaped with the planet as its capital.
When these historical people drove a lot of the Taung off Coruscant, they fled to the outer rim, the place they stayed for hundreds of years till a warlord united all the species for a battle of conquest in opposition to a brand new planet that will grow to be their new birthright as a species. That planet was Mandalore, and these Taung had been the unique Mandalorians.
None of that’s half of the present Star Wars continuity, however we’re speaking about tons of of 1000’s of years earlier than the time of any Star Wars story. This does not have a lot bearing on the current so you could possibly embody this in your headcanon with out it affecting the rest, actually.