This is the second time Paul Reubens has portrayed Penguin's father. He also portrayed the biological father of Oswald Cobblepot in Batman Returns.
The movie the prisoners are watching is "Seven Brides for Seven Brothers" (1954). This movie starred Julie Newmar, who has starred in the Batman universe before, playing Catwoman in the 1960's tv series "Batman" (1966).
The prescribing doctor on the prescription bottle for Elijah Van Dahl (Paul Reubens) is Anu Schwartz. Schwartz was art director for 31 episodes of the series.