Throw It In: Chunky's colorful pelt started out as a joke in the art department. Artist Leighton Hickman was bored with the drab colors being used for the creatures appearing in the desert scenes, and painted the saber-tooth tiger character in bright "parrot" colors. The filmmakers liked the look for Chunky so much that they kept it for the film.
What Could Have Been: This was originally set to be the next stop-motion film by Aardman Animations with Dreamworks after Flushed Away (which explains why Aardman's Peter Lord and David Sproxton are thanked in the end credits), but they parted ways due to conflicting relations and the movie was shifted to Dreamworks Animation proper. Chris Sanders agreed to helm it, but he was starting How to Train Your Dragon and wanted to finish that first.