Just days after he arrived in Massachusetts to begin filming scenes for Edge of Darkness , Robert De Niro has quit the film. "Sometimes things don't work out; it's called creative differences," a spokesman for the actor told Daily Variety. Earlier this week the Boston Herald reported that De Niro had been spotted filming scenes at the 15th hole of the Gannon Golf Club while director Martin Campbell ( Casino Royale ) attempted to set up a shot that would show the actor, a sand trap and the Boston skyline in the shot. De Niro was to have costarred in the movie with Mel Gibson, who has not appeared in a movie in six years.