The ill-fated archaeologist in the opening sequence was modeled after British actor Peter Cushing, specifically Cushing's role in Hammer's The Mummy (1959).
Nichelle Nichols (Thoth Khepera), David Warner (Ra's al Ghul), and Brock Peters (Lucius Fox) all starred in Star Trek VI: The Undiscovered Country (1991) as Commander Uhura, Chancellor Gorkon, and Admiral Cartwright, respectively. Along with this, LeVar Burton appeared a few episodes prior in The Worry Men as Hayden Sloane. He is also of Star Trek fame as he played Geordie LaForge throughout all 7 seasons of Star Trek: TNG.
Thoth Khepera refers to herself as Legion, because many have shared their knowledge with her. This is an allusion to the biblical demon Legion.
This marks the first time that Batman is shown to be willing to kill a sentient being.
The moment Thoth initially appears as a young pretty woman, as she arises from the Lazarus Pit and seduces Ra's, only to reveal her true self as an aged hag after she embraces him, is similar to a scene in The Shining (1980) where Jack Torrance (portrayed by Jack Nicholson, who coincidentally played the Joker in Tim Burton's Batman (1989) movie) investigates the bathroom of Room 237.