This episode marks the beginning of the use of new Shadowblades. They no longer light up as they did in Season 1 even though this episode is a direct continuation of Season 1.
Maxim and Alan both portrayed their respective characters' own younger versions in a flashback scene that took place much earlier than the flashback events in "Of Men and Angels", where they were portrayed by different, younger actors to show their characters' youths and the time passage.
The episode picked up right where the Season 1 finale, Morning Star, left off.
This episode shares a name with the ninth chapter of City of Glass.
The episode was originally titled as "The Guilty Blood".