The late Jon Landau is sharing a behind the scenes look at making the 1997 James Cameron film, “Titanic.” In a new posthumous memoir, “The Bigger Picture,” which hits shelves on November 4th, an excerpt shared with The Hollywood Reporter on Tuesday sheds light into the “challenging” process. While production was happening, there were rumblings of issues happening on set. “We spent many months in postproduction. Entire plot devices, scenes we took great care to shoot, fell away as we pieced