Anakin’s voice telling Rey to restore the balance in Rise of Skywalker. Is obviously a reference to the chosen one who will bring balance to the force, by doing away with the Sith.
Palpatine’s resurrection was obviously done through cloning and manipulation of midi-chlorians. Its referenced by the dark side of the force is a pathway to many abilities line. And obviously a reference to his discussion with Anakin in episode III about Darth Plagueis.