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 scene depicting a meat-eating sequence led to several extras becoming ill due to eating undercooked meat. Brockie and Gorman instructed the extras to act as if they were eating it, but they did not comply with the instructions.