For starters, I do Not believe that is the only thing wrong with the Z film. Have you ever watched the SS Reconstruction Film that was done inside Dealey Plaza less than 1 week following the assassination? David Von Pein, (he is active on this forum), has posted it over on You Tube. Search "1963 Secret Service Film (JFK Assassination Reconstruction) (Silent)". Go to 24:18 - 24:24. The SS is filming from the Zapruder Perch as they "Reconstruct" Zapruder filming down onto Elm St. What do we see? We SEE the short wall. We SEE the Black Dog Man position. We also SEE a good stretch of the flat cement walkway that leads into the Pergola Shelter behind Zapruder. We also SEE much of the dirt/grass area between the flat cement walkway and the Picket Fence. We SEE ALL of this on the SS Reconstruction, but we see NONE of this on the Z Film. And remember that this film footage is a "SS RECONSTRUCTION".