Bob Woodward‘s new book about Deep Throat, The Secret Man, isn’t due out until next Wednesday, and is under embargo until then, however, USA Today says it purchased the book yesterday “at a store in Fairfax County, Va., that had mistakenly put copies out for sale.” It spills the beans in a report by Mark Memmott. Among other revelations: The garage where Woodward met W. Mark Felt — Deep Throat — was at 1401 Wilson Blvd. in Arlington; and “Watergate aficionados who were thrown off for years by the fact that Woodward had said Deep Throat smoked cigarettes — while Felt had said he did not — should not have been so concerned. Felt did smoke during their clandestine meetings, Woodward writes, possibly out of nervousness.”

• RELATED: “Actor Robert Redford was spotted leaving the Georgetown home of The Post’s Bob Woodward yesterday with a copy of the Pulitzer Prize-winning journalist’s new book, The Secret Man: The Story of Watergate’s Deep Throat, which is due out Wednesday,” reports The Washington Post itself, in its Names & Faces column. Woodward wouldn’t say if a movie was in the works, only that “There was a very serious discussion and the focus was on Watergate. . . . Redford, like me, has this endless fascination with Watergate. He gets it.” As Michael Cader noted on his Publisher’S Lunch e-newsletter (unavailable as a link), the story “begs the question, is the item a bad plant, or is the newspaper actually staking out their own reporter’s home?”