This is the first season finale in which Richard Dean Anderson (Jack O'Neill) does not appear.
This episode bears several simmilarities to the Atlantis season 2 finale "Allies, pt. 1" in that both the Oddyssey and the Daedalus are in combat with enemies, Oddyssey and Korolev battling the Ori fleet and the Daedalus battling the Wraith, and the fact that both Lt. Col. Sheppard and Lt. Col. Mitchell both get onboard a F-302 to fight their respective enemies from their ships.
The Ori succeed in having a permanent beachhead in this galaxy by completing a supergate becomes active in this episode.
The Korolev, the third space carrier built by the U.S. and turned over to the Russians in order to keep their gate, makes its first appearance in this episode.
Beau Bridges (General Landry) does not appear in this episode.
[Jackson drops a book onto the floor]
Jackson: (to Mitchell) Sorry to wake you.
Mitchell: (Startled awake) No, ah, I wasn’t sleeping. I was Kel'nor'eem'ing. Teal’c taught me the fundamentals.
Jackson: Did he mention you should stay conscious in the process?
Mitchell: Yeah, I’m still working on the basics.