Although several of the 'human death' scenes are very obviously faked, there are occasionally splices of footage captured during times of war that add a very real flavor to the preceedings. Also featured are the actual, on-camera deaths of a variety of animals, including seals being clubbed to death and animals being killed on the slaughterhouse line.
The most famous (or perhaps controversial) scene includes the 'murder' of a live monkey, who is then prepared and served to patrons of a 'gourmet' restaurant. Although slap-dash in editing, the deaths all seem very realistic and are rather disturbing.
'Faces of Death 2', an even lower budget sequel to this, was released in 1981.