This episode, featuring longtime Batman villain Clayface, shares the same title as the episode of the first appearance of Clayface in "Batman The Animated Series" (1992)
The episode title is a play on the biblical phrase "feet of clay" used to imply a weakness or falling in a person previously thought to be perfect or near-perfect. The meaning behind the phrase dates back to the Greek mythological figure Pygmalion and his creation, Galatea.
The villain Clayface has a son named Chris Cassius. This makes the villain's name, shortened, "Clay Cassius," a play on the birth name of Muhammad Ali