In Greek mythology, Ethon was the eagle-like chimera that had been sent by Zeus to devour Prometheus's liver every night, as punishment for stealing fire from the gods and offering it to mankind.
General Landry does not appear as Beau Bridges was filming Stargate: Atlantis (2004) Critical Mass (2005).
Obvious Product Placement: The beer provided to Daniel by Mitchell at the end of the episode is Coors Light. Each time either Mitchell or Daniel holds the can, its label clearly faces the audience.