Originally conceived as a film with live actors playing the human characters.
Evan Rachel Wood's second theatrically released animated film after The Reef - Amici per le pinne (2006).
Danny Glover's fourth theatrically released animated film after Z la formica (1998), Il principe d'Egitto (1998), and Barnyard - Il cortile (2006), all but one of these were also computer-animated.
Danny Trejo's first time voice acting in a theatrical film. Later he'd go onto voice Skeleton Luis in Il libro della vita (2014), Jasper the Stork in Cicogne in missione (2016), Boots the Monkey in Dora e la città perduta (2019), and Stronghold in Minions 2 - Come Gru diventa cattivissimo (2022).
Justin Long's first time voice acting in a theatrical film, later he'd go onto voice Alvin in the live-action Alvin and the Chipmunks films, Lem in Planet 51 (2009), Humphrey the Grey Wolf in Alfa & Omega (2010), and Patchi the Pachyrhinosaurus in A spasso con i dinosauri (2013).