The Matrix Makers One year, two sequels—and a revolution in moviemaking. An exclusive look behind the scenes of 2003’s hottest flicks Jan. 6 issue — The Warner Brothers studio lot in Burbank, Calif., is frenetic on most days, but on a Thursday in early November it was really humming. The company’s box-office Bigfoot for 2002, “Harry Potter and the Chamber of Secrets,” was set to open in eight days, and nearly every division of the studio was working furiously to get it ready. Until 2:30 p.m. That’s when everything stopped. For the next half hour, the boy wizard had to...