Final appearance of Hudson Leick as Callisto.
The Dagger of Helios had appeared previously on season two episode "The Quest" as the key for the ambrosia.
Final appearance of Timothy Omundson as Eli.
At 27 minutes Ares states "Might is Right". This is the title of a book, subtitled "Survival of the Fittest" first published in 1890. It advocates amorality.
Twice in this episode we hear the phrase "Twilight of the gods" which references Ragnarok in Norse mythology. It is a series of events resulting in the deaths of gods.