State-of-the-art facial motion capture technology was used during the voice recording. This gave Carl and Harry very precisely synchronized mouth animation, as well as expressive idiosyncrasies, and greatly sped up the animation process.
Filming initially took place at various London pubs, and the animated characters were superimposed in to the filmed environments during post-production.
A custom-built digital puppetry rig was constructed at Putty Studios to perform and capture some of the body motion.