Joel Schumacher and David Kajganich had a falling out over all the changes Schumacher wanted in the script (not unlike what happened between Schumacher and Andrew Kevin Walker on 8MM (1999)). The director won and re-wrote parts of the script himself.
Was the poor pig being slaughtered, and all the other disgusting animal abuse in this movie for real?
I don't think that ANY "abuse" of animals is real, this is just a movie. There are groups that watch for these kinds of things in movies, and really harming animals is illegal.Also, yes, the pig was being slaughtered. But how else do you get pork?