Conker's Bad Fur Day started out as a sequel to Conker's Pocket Tales called Twelve Tales: Conker 64, but was changed to the more mature Conker's Bad Fur Day due to people calling the game 'cutesy', making Rare overreact.

Around the time of its announcement, Rare had already made two similar games, Banjo-Kazooie and Diddy Kong Racing. They feared criticism for making another innocent platformer starring cute animals. So, in 1999, Rare Ltd. revealed that they were going to redesign the game to appeal to an older audience.

If you stand idle for a while, Conker will get out his Game Boy and play it. You don't get to play with it, but you can hear him playing Killer Instinct, another game made by Rare.

Chris Seavor voiced all of the male characters in the game besides The Great Mighty Poo.