Chronic Hero Syndrome: Although he's spent the last year basically in hiding because he doesn't want to face death again, Jack ultimately follows Silo up to Trear Station to assist her investigation.
Continuity Nod: The fictional Icelandic city of Polar Ventura, originally mentioned in Bad Wolf, gets a reference here.
Malfi's eyes are extracted just because someone decided she wanted them instead of getting implants.
After returning to Earth, Gorky takes Vortia's eyes so that he can access her accounts.
Failed a Spot Check: Malfi and Silo likely assume this is the reason Jack was alive after Malfi failed to find a pulse (particularly since Malfi has no eyes so likely assumed he just wasn't looking in the right place).
Ignorant of Their Own Ignorance: At this point Jack is unaware that he's immortal, assuming that he just "blacked out" in his confrontation with the Daleks or that he got lucky when connecting electric cables to activate a force field.
Kick the Dog: Vortia constantly dismisses her servant Gorky, even as he remains relatively loyal to her.
Nice Job Fixing It, Villain: When Gorky comes to rescue Vortia from Jack, Silo and Malfi, her yelling at him even when he's trying to help finally pushes Gorky to give up on his service to her and declare that he will let the others have Vortia right now.
