The bickering brother superheroes Hawk and Dove are voiced by Fred Savage and Jason Hervey, who played the brothers on the TV series The Wonder Years (1988); unlike "The Wonder Years", however, Savage voiced the older, more aggressive brother (Hawk/Hank Hall) while Hervey voiced the younger, more docile brother (Dove/Don Hall). It was originally intended for their relationship to match "The Wonder Years", but during the voice reading session, they unexpectedly switched roles for one of the readings and that was kept for the episode.
The Annihilator resembles Monarch, a DC Comics super-villain who was actually an evil version of Hawk.
Reference is made to Queen Audrey of Kasnia who first appeared in Justice League episode "Maid of Honor". She assumed the throne when her father the King suffered a stroke, so the fact that she's still Queen indicates that either her father is still incapacitated from his stroke or he passed away.
Ares returns to Hephaestus on a Tuesday, the day named for Mars (Ares' Day, as he was known in Roman and Tyr's Day from Norse mythology).
Ares' pseudonym Sera is his name spelled backwards.