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).
Fleetwood Yak is named after the band Fleetwood Mac.
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.