What to Watch: Marathon From writer-directors Keith Strausbaugh and Anthony Guidubaldi, Marathon is “a cheeky, giggle-filled mockmentary” (The Film Yap) that tracks an assemblage of improbable partakers of a long-distance race “Christopher Guest-style” (Projected Figures). The mock-doc begins three months before Devil’s Canyon Marathon, an underfunded local race organized by shoe store owner, Ed Clap. …