The meat-eating scene at the end made a number of extras ill, as they actually ate the (undercooked) meat (Brockie and Gorman claim to have instructed them to act like they were eating it, and they didn't listen).
The meat-eating scene in the film resulted in some of the extras getting sick because they ate raw meat. The actors who played the extras were supposed to pretend to eat the raw meat, but they didn't follow the directions given by Brockie and Gorman.