As he is about to shoot Scene 12, Marsha, Queen of Diamonds refers to the Penguin as "C.B." This is a reference to the silent era and Golden Age of Hollywood film director Cecil B. DeMille.
Mortimer, the "monster" in Aunt Hilda's cauldron seems to be a callback to the monsters Adam West faced in the The Outer Limits (1963) episode The Invisible Enemy (1964).