Steven Spielberg has one major regret for the movie that defined his career. The Oscar-winning director has revealed that editing firearms out of the 20th-anniversary edition of “E.T. the Extra-Terrestrial” was something he wishes he hadn’t done. During the TIME100 Summit in New York City this week, he explained how a scene in the 1982 original in which federal agents chase young kids with guns was edited to instead feature walkie-talkies in the 2002 release. “That was a mistake. I never should have done that,” Spielberg, 76, said. “E.T. is a product of its era, and no film should be revised b...