Unlawful Killing," a documentary about the death of Princess Diana that began to stir up controversy even before it got [to the Cannes Film Festival, was] directed by Keith Allen [and] earned global [comment] for including a graphic image of the aftermath of the car accident that took Diana's life in 1997, the details of which have historically been distorted in the interest of taste. The photo does appear in "Unlawful Killing," but only for a moment, and within the legitimate context of Allen's claim that Diana received tardy and inadequate care immediately after the wreck and that a more timely response would have saved her life. "Unlawful Killing," which is part of the Cannes "Marche du Film," or Film Market, and played here ... to a packed house of buyers and critics, will surely raise hackles for the additional ... accusations Allen levels in the film. These include allegations ... that Diana was murdered, most likely by a cabal involving the royal family, the political establishment and the secret services; that she was killed because she was threatening the British arms industry with her work against land mines; and that the inquest into the death ... was little more than a coverup in which the media were ... complicit.