From Issue #8, a flashback to the end of the Sith-Imperial war, Emperor Fel and two Imperial Knights are discussing the political situation. How does Moff Calixte go about spying on three highly trained force-users? She hidesbehind a curtain.
Darth Nihilus makes a cameo as an old holocron that Darth Krayt briefly listens to. He stops listening to it midway through it's speech because he can't understand a word Nihilus is saying.