Continuity mistake: When Mando repossesses the knob, the Child's ears go from straight to floppy in the space of a camera cut. (00:02:30)
Continuity mistake: The Client tosses the fob on the desk. He then fetches the pot of Beskar and puts it on the desk, but the fob changes position. (00:06:05)
Continuity mistake: The pile of beskar in front of the Armorer changes wildly in size and distribution depending on the camera angles. (00:09:15)
Continuity mistake: Mando knocks at the door and grabs the rude TT-8L/Y7 gatekeeper droid, ripping the eye part out entirely, nothing left on the arm. Mando then gets out of the Imperial hideout, he does it from the front door. By the door, but the security device has its eye back, still dangling off a cable. (00:19:55 - 00:24:30)
Continuity mistake: The scientist ducks into cover and the Mandalorian disappears, Batman-style. The position of Dr. Pershing's right hand is different in the last cut. (00:22:10)
Continuity mistake: Mando obliterates a guy on the roof using his long range rifle. He lowers the weapon, but he's seen lowering it again after the reaction shot on Carl Weathers. (00:27:50)
Answer: In (non-canon) Legends, Thrawn was the central character of a trilogy of novels by Timothy Zahn. He was a Chiss officer in the Imperial Navy, who rose to the rank of grand admiral despite being non-human. Thrawn was brought into canon in the Star Wars Rebels series, where he commanded the Empire's Seventh Fleet and led the occupation of Lothal, which was opposed by the series' protagonists including Ahsoka Tano. In the final episode of Rebels, the Jedi and Rebel Ezra Bridger commands Purrgil space whales to drag Thrawn's Star Destroyer into hyperspace, jumping to an unknown location with himself and Thrawn on board. The final scene of the series shows Ahsoka Tano and Sabine Wren leaving Lothal to search for Bridger, and presumably Thrawn.
Sierra1 ★