5. Mustafar
The secret castle of Darth Vader is uncovered when Director Krennic races to gloat about the Death Star’s effective weapons test.
Lucasfilm’s Pablo Hidalgo affirmed in a tweet to a fan, that the Sith ruler still lives on the planet which made him after losing to Obi-Wan Kenobi in Revenge of the Sith.
Initially, the castle was expected to show up in the 1980’s Empire Strikes Back before it was erased. Furthermore, Ralph McQurrie, designed it. It showed up later in different stories in Rebels.
6. T-15s
We hear a couple of Stormtroopers talking about the suspension of “the T-15s” on the tropical universe of Scarif. This is a reference to the future generation. As it is, Luke owned a T-16 on his home planet of Tantooine. On it, for target practice, he would utilize womp rats as and race Beggar’s Canyon.
