The barber's name is Floyd, a possible nod to the Nirvana song "Floyd the Barber", from the album "Bleach" which itself was a reference to The Andy Griffith Show (1960).
Russell Brand and Ricky Gervais were considered for the role of Angus Scattergood.
Two of the stars had previously provided voices to a main character in the Avatar: The Last Airbender (2003) franchise. Mae Whitman, who does the voice of Darma, did the voice of Katara in Avatar: The Last Airbender (2003) and J.K. Simmons, who does the voice of Khampa, did the voice of Tenzin in its sequel series The Legend of Korra (2012).
This is Sam Elliott's fourth time voicing a character in a film after Barnyard (2006), Marmaduke (2010), and The Good Dinosaur (2015).
The second animated film where Eddie Izzard co-stars with a Wilson brother. The first was Cars 2 (2011) where Izzard voiced Miles Axlerod and Owen Wilson voiced Lightning McQueen.
This is Ash Brannon's second animated film after Surf's Up (2007).
This is Lewis Black's second animated film, after Inside Out (2015).
Eddie Izzard's fourth fully CGI animated film after The Wild (2006), Igor (2008), and Cars 2 (2011).
Sam Elliott's second time collaborating with a Wilson brother. He previously did so with Owen Wilson in the live-action film Marmaduke (2010), where they both voiced dogs.
J.K. Simmons' third animated film that features anthropomorphic animals and no humans or non-anthropomorphic animals, after Kung Fu Panda 3 (2016) and Zootopia (2016).
