Nero bears an earring in the form of a chain. This refers to his sibling Andromeda Shun, who has the power to manifest chains.
One of the artifacts Kido has in his collection is the Medusa Shield, a weapon wielded by the Saint Perseus Algol.
During the battle with Nero, Seiya quickly traces the Pegasus constellation with his hands before attacking, a move from Seinto Seiya (1986).
Cassios has a tattoo on his arm of Ophiuchus, a man holding a snake. This refers to his mentor Ophiuchus Shaina.
The filmmakers based the Cloth armors on ancient Greek armors, and consulted European blacksmiths for advice on making the designs practical and realistic.