The scene in the cab where Emma is gassed is identical to the one in the Fritz Lang silent Dr. Mabuse, the Gambler (1922), where Chief Inspector Wenke is gassed in a cab.
In one scene, the words Z.Z. von Schnerk production appears around Emma's face while she does a lion's roar, a reference to the MGM logo.
Epic features several recurring props from earlier season 5 installments. Emma Peel walks past the abstract painting from From Venus with Love (1967) just before she first encounters Damita Syn. The "Simon Roberts and Son" sign from The Winged Avenger (1967) can be seen behind the policeman after he falls to the ground in the fake alley.
According to producer Brian Clemens, the character of Z.Z. von Schnerk was based on Erich von Stroheim.