Right after the girl is abducted, the scene shifts to show a panoramic view of the Gotham buildings, and the distinctive "Q" for Queen Consolidated is seen. Although only a child at this time, Oliver Queen eventually becomes the Green Arrow.
There is a scene in which Edward Nygma has a cup bearing a "?". This is the symbol for his comic book counter part The Riddler.
The name 'Gotham' literally translates from Old English as 'Place of the Goat' giving added significance to the villain's title. It also refers to an English town nicknamed the 'place of fools' after its' inhabitants feigned madness to hoodwink King John.
Dan Hedaya and Carol Kane were both part of Addams Family movies directed by Barry Sonnenfeld.
Harvey said of Hypnotherapy: I was reading about that, and it said that if a patient has a compulsion like a bad idea or an impulse that the hypnotist can put the poor sap under and introduce a physical movement like clenching your fist. So instead of doing what the compulsion wants the person to do they just clench their fist.