Opinion is sharply divided as to how high the superhero pic can fly when it hits theaters, with some suggesting a much lower range of $90 million to $120 million.

An early "Superman" teaser shot was mocked online for its depiction of the hero's flight. James Gunn said the shot "kind of got by" him.

The writer/director of this summer's "Superman" and the co-head of DC Studios offers a peek behind the curtain.