As a gag, Steve Coogan featured three review quotes on the back of the UK version of the DVD, the first review reads: "Unarguably the greatest film ever made" which was quoted by Alan Partridge, a fictional character created by Coogan. Another review says "A Bag of Sh*te" quoted by Paul Calf, (another fictional creation of Coogan's), while the third review is a standard quote from a Hot Dog magazine review which reads: "Coogan is the new Peter Sellers".
Simon Garden suffers from hypoglycemia. This is a backhanded tribute to Armando Iannucci who worked with Steve Coogan on his Alan Partridge character. The disorder is like a reverse diabetes in which the sufferer has to ingest carbohydrates on a regular basis to combat overproduction of insulin. This is why Simon is constantly eating potato crisps (US: "chips").
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.