Hitchcock assisted, did NOT film and did NOT direct!
The great Hitchcock did NOT film nor did he direct the earlier documentary suppressed by the British on which Night Will Fall is based. Lord Sidney Bernstein was the director who brought his good friend Hitchcock in to assist with the script and the editing of the original 1945 film which was never completed. See the following:
"Sidney Bernstein, the film's director, persuaded his friend Alfred Hitchcock to leave Hollywood and come to England to collaborate for several weeks in the making of the film. Hitchcock arrived in late June, after the Belsen material (the first three reels of the film) had been assembled. He left in late July, two months before work on the film appears to have stopped. According to Bernstein, Hitchcock would not take a fee for his work.
Hitchcock is credited as "treatment advisor." He acted as a consultant in organizing the footage, along with writers Colin Wills and Richard Crossman (both of the London News Chronicle) and editors Peter Tanner and Stewart MacAllister." (From:http://www.pbs.org/wgbh/pages/frontline/camp/faqs.html)Of course saying that it's Hitchcock's film is great for PR, but it's NOT TRUE! Let us give credit where credit is due!