This shot of the System Lords biting into "live" Goa'uld symbiotes was filmed by the actors biting into long burritos filled with noodles, which were later turned into symbiotes by CGI.
Nirrti has previously been shown to be a System Lord. Because of her previous attempts to kill Kronos and other System Lords, she has been ousted. Jackson mentions this in part 1 of this 2-part episode.
Being a two-parter, this second episode shares the same identical on-screen guest and end credits, and thus several actors not appearing in this episode receive on-screen credits.
Richard Dean Anderson (Colonel Jack O'Neill) previously appeared in an episode of MacGyver (1985) with the same title: Last Stand (1985).