The scene showing General Landry pulling up to Area 51 is recycled from Touchstone (1998). The then Major Reynolds can be seen walking out to meet the SUV. Major Reynolds would go on to become a Colonel commanding SG-3 in numerous episodes including this one where he commands the team that discovers the kassa.
This is the first appearance of the Odyssey, the new Daedalus-class ship that replaces the Prometheus, destroyed in Ethon (2006).
The name of the character Nerus, played by Maury Chaykin is a nod to the starring role he played in his own series, A Nero Wolfe Mystery (2001).
When Daniel Jackson says he's going to find a doctor, this is a humorous nod to the fact that Michael Shanks is married to Lexa Doig, the actress playing Doctor Lam.
First of six appearances of Matthew Glave as Colonel Paul Emmerson, Commander of the USS Odyssey. He also appears in Camelot (2006), Flesh and Blood (2006), The Pegasus Project (2006), Counterstrike (2006), and Company of Thieves (2006).
Peter DeLuise: the guard standing behind General Landry's left shoulder when he is speaking with SG-1 after they return through the gate.