Visible crew/equipment: When Omera brings The Mandalorian some food and says how she noticed he hasn't eaten, a boom mic can be briefly seen just above her head. (00:16:33)
Visible crew/equipment: The kid actors in the school scene several times break fourth wall looking very distinctly at the camera. The kid directly behind the Child does it right away as Carl Weathers brings it there, and when Gina Carano is heading out there's a kid in the foreground who steals a worried peek at the camera, impossible not to notice. (00:09:05)
Visible crew/equipment: When one of the guards cries "Destroy it!" watch to the left of Karga and you'll see a crew member in jeans hiding behind a wall. This was later edited out on Disney+. (00:18:54)
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 ★