Sex, drugs and amoebic dysentery: the 20 best making-of documentaries – ranked!

<p>From tropical disasters and doomed sci-fi epics to bribing Orson Welles and fending off a puma, we rate cinema’s most revealing glimpses behind the scenes</p><p>Behind-the-scenes footage from Dawn of the Dead is the highlight of this aficionados-only affair, which follows the 19