The stuffed koala with the drugs in it is a reference to director John Duigan's Australian background. It was originally to be a rabbit, so the ears of the stuffed toy could be seen peeping out of the top of Inspector Burton's bag.
The outside shots of the West Clyde Bank were filmed in an old bank in Castle Street, Liverpool. The interior shots identify it as being the Deansgate Branch, Manchester.
A CGI shot of a wasp flying up Steve Coogan's nose took 12 hours and 10,000 feet of 35mm film before the wasp flying in a small glass cabinet could be coaxed into the nostril of green wax head
The ring in the model pig's nose changes from horizontal to vertical before and after the pig is cut in half. The blade would otherwise have had to cut through the ring, which is intact throughout.