Special effects were done by Weta Workshops, the same crew who did the Lord of the Rings trilogy.
Just before Mike (Mick Rose) is attacked by a killer sheep, he is seen reading "The Penguin History of New Zealand", a well known book written by the late Dr Michael King, the father of _Black Sheep_ director Jonathan King.
WILHELM SCREAM: While the people at Angus's speech are being attacked by the sheep, two men try to get into a car, and the one on the driver's side gets pulled down by a sheep and screams.
The man who is pulled down by a sheep while trying to find the keys to his car is the director, Jonathan King.
Released in Spain as a double feature with Severance (2006).