Light glinted off a deep red 1951 Ford Mercury Saturday afternoon at the 36th annual Roseburg Benefit Car Show at the Douglas County Fairgrounds. The paint has crushed up jewelry in it to make it sparkle, owner Wayne Williams said. The Mercury was used in the classic 1973 movie “American Graffiti” and has been restored to its original glory. The car was one of 75 vehicles on display in the annual benefit organized by local car clubs, the Stray Angels and the Umpqua Flatheads. Cars from as far back as the 1910s lined Douglas Hall. Proceeds from this year’s show …