"I wasn’t even reading any science fiction back then [when I was a kid]. My father was an insatiable SF buff, but I never read his magazines. Maybe it was just because of my father’s interest. On the back of the porcelain toilet, he had ‘Analogs’ stacked up to the ceiling and just about every SF short story he could find. He was especially interested in time travel and inter-dimensiona ideas, but that didn’t rub off on me at all."
Spielberg talks about fantastical film-making in this wonderful interview from Starlog #17.