Upon completion of the film and edit, director George Clarke leaned over to get a second hard drive to back up the project. His foot caught the wire of the main hard drive and brought it to the floor, smashing it and losing the completed film. George made a cup of tea, then sat awake for the next 72 hours to complete a new version which is the released edit. Afterwards, exhausted and delusional, he continued to do the audio commentary for it.
All of the fight scenes were choreographed on the spot on the day of filming, with about 30 minutes of practice before shooting the real thing. Director George Clarke was the main choreographer with co-stars Peter Meehan and Gary Whelan helping.
The set of The Knackery was a genuine recycling and skip hire place as advertised in the film. This was done as a thank you to the guys for letting the production use their place.
The star of the skip hire advertisement in the film is Jonny Kirk, owner of the skip hire company and set, and also assistant director to George Clarke on their first film, Battle Of The Bone. Jonny can also be seen as one of the final zombies who gets punched right in the mouth by Gary Whelan.
The set was quite big, but with the recycling company moving things about every day this allowed the team to make it look like it was twice as big without any effort. Nothing was added to the set at all.