The first episode directed by Peter DeLuise. He ends up directing more episodes than anyone else (56--more than a quarter of the series) and later becomes one of the show's writers (seasons 4-8) and producers (seasons 6-9). He also directs another 13 episodes between the two spin-off series.
O'Neill calls the signaling device a GDO. This acronym actually stands for Garage Door Opener.
The episode's title alludes to the phrase 'swan song' which is an idiom for a final act before death. The serpent in the title refers to Apophis who is the serpent god.
Peter LaCroix only appears in a split second excerpt from a previous episode, but still receives main guest credit.
First mention and (non-physical) "appearance" of Sokar.