Director Jake Gavin is a fan of Wittertainment on 5Live and added a "Hello to Jason Isaacs" to the end credits as an in-joke for fellow Kermode and Mayo fans.
Dougie's dog is named Braveheart.
Peter Mullan appeared in Braveheart as a veteran in some of the battle scenes.
Peter Mullan & Keith Allen both starred in Trainspotting (1996)