The monster at the beginning is a clear parody of Gamera, a giant radioactive turtle that breathes fire, flies through the air like a saucer by firing thrust through its leg holes. The giant turtle's red hair, however, is a reference to Jimmy Olsen, who sometimes transformed into a giant turtle boy in the comics.
First episode that shows new Supergirl's outfit. It resembles the outfit the live-action movie version Supergirl wore in Supergirl (1984) and was later used for Post-Crisis Matrix version of Supergirl in the comics.
Travis Morgan is the Warlord of Shambala. Shambala is the mythical Kingdom of legend that many cultures and societies have sought to find. It is believed to be any different things but essentially a paradise of enlightenment and living by the sword.
The working title was "Heart of Stone".