Originally conceived as a film with live actors playing the human characters.
Danny Glover's fourth theatrically released animated film after Antz (1998), The Prince of Egypt (1998), and Barnyard (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 The Book of Life (2014), Jasper the Stork in Storks (2016), Boots the Monkey in Dora and the Lost City of Gold (2019), and Stronghold in Minions: The Rise of Gru (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 Alpha and Omega (2010), and Patchi the Pachyrhinosaurus in Walking with Dinosaurs 3D (2013).