Princess Leia's outfit is based on an early design for Star Wars (A New Hope) by Ralph McQuarrie. That particular design was never colored, but the colors featured here evoke those of the Tantive IV crew members seen in Revenge of the Sith, bridging the two eras.
The symbol on Leia's hair clasp was first seen on Bail Organa's belt buckle and wardrobe in Episode III Revenge of the Sith.
The Hammerhead corvettes are inspired by designs seen in the Star Wars: Knights of the Old Republic (2003) video game.
Though Leia is treated as a mature adult while Ezra is still very much treated like a young trainee, the two are nearly the same exact age, both born within hours of one another on the day the Old Republic fell and the Empire rose.
In late 2015, some sources announced the title of this episode to be 'The Secret of Prisoner X-10', but this was actually the working title to the previous installment, 'Legacy' in which the character of Ryder Azadi was also known as Prisoner X-10.