John is trying to get a ride to Invercargill and wanders into a dispute outside the Auckland bus station between Gerry and a traffic cop. When he tells the cop he's "involved" with Gerry and the yellow Mini, the cop asks John for his name, and he replies, "Smith". The cop smirks and walks away. Smith was the name of the main character in Sleeping Dogs, who was played by Sam Neill. The traffic cop in Goodbye Pork Pie was played by Clyde Scott, who played Jesperson in Sleeping Dogs. Jesperson, a crooked cop, relentlessly pursued the innocent Smith until his death, for "crimes against the government". Ian Mune scripted both Goodbye Pork Pie and the screenplay for Sleeping Dogs.
There's only one sure thing in this life, Blondini, and that's doubt. I think.
When the Family in the Yellow Mini wait at the Railway crossing south of Picton for the Train to pass, an XD Ford Falcon is seen on one of the wagons. The XD was not released until 1979.
When originally released theatrically in the UK, the BBFC released this in a shorter form at 94 minutes 34 seconds to secure a 'AA' rating. The film was then released to home video in 1995 with an '18' rating running to the longer 102 minutes (PAL) (105 minutes theatrical) run time.