When Chloe enters Watchtower she gives the Verification Code #051409. Jimmy gave Chloe Watchtower as a wedding present. May 14 2009 is the original airdate of the episode "Doomsday" and the supposed date of Jimmy's death. However, in "Savior", the date was shown as September 25, 2009, which took place three weeks after the events of "Doomsday". So, Jimmy's death actually would've taken place in September, not in May.
This is the final appearance of Amanda Waller on the show. While presumed deceased, character's fate and storyline was left unresolved as the character was going to be used in the Green Lantern film, which was in production during season 10. A similar situation later happened on Arrow when studio politics resulted that show's versions of Waller and Deadshot being killed off due to their use in the Suicide Squad film.
This episode marks Justin Hartley's writing debut on the series; and as well as the first time a series regular has written an episode.
Lois Lane does not appear in this episode. This is the final episode of the entire series not to feature Lois, as she will appear in the final two episodes of Season Nine and all 22 episodes in Season Ten.
Zod and Oliver finally meet.