The 3D release of “The Wizard of Oz” inspired Susan Wloszczyna to write about some surprising facts, updates, and behind the scenes information about the film. Does that “Wherefore art thou, Romeo?” voice in “If I Only Had a Heart” sound familiar? I would never have guessed who that was. What simple trick was used to make it seem that the Wicked Witch’s head was shrinking as she melts? I would never have guessed that one, either. Take a look — and then take the family to see “The Wizard of Oz 3D” this weekend.