The Hermit's Hat constellation is visible once the Stranger, Nori and Poppy arrive in Rhûn. This confirms an error which was implicit in Season 1, namely that the visibility of constellations changes with the observer's latitude, not longitude. Traveling east to Rhûn should not change the constellations that the Stranger and the Harfoots can see. The error evidently derives from the ambiguous syntax of Aragorn's statement in J.R.R. Tolkien's "The Fellowship of the Ring", "I have crossed many mountains and many rivers, and trodden many plains, even into the far countries of Rhûn and Harad where the stars are strange." The phrase "where the stars are strange" should apply only to the land of Harad to the south, not to Rhûn.
When Círdan sails into the harbor, the sail and rigging are flapping loosely yet the boat still moves forward rapidly.
At about 1 min, the English closed captions should say Poppy is speaking rather than Adar.
In the opening scene, Sauron kneels to be crowned. People only kneel to receive an award from someone superior, mostly their monarch. And it was quite common for monarchs to crown themselves. Napoleon did this, and Charlemagne urged his heir to crown himself, as rulers of the Eastern Roman Empire did.