There was a reference to the Guardians of the Whills, which is a term that’s never been used on-screen. The very first Star Wars screenplay referred to the Journal of the Whills as a sort of holy book about the Jedi.
The whole concept of the Death Star weapon using kyber crystals is something that’s been part of fanon and referenced in the RPGs for a long time, but has never been official. Having it brought into canon was a hugely nerdy moment.
