According to senior producer Jeff Gardiner, two minor details for butterflies and ants were removed before the game's release, because they were causing lag. Butterflies were intended to have a mechanic where if they detected flowers in the player's inventory, they would start following the player, but it was not anticipated that since this system affected every butterfly in the game, it would use a significant amount of processing power. Similarly, when artist Mark Teare added ants to the game, every ant was accidentally set to cast a shadow, a feature at the time that was considered "the most expensive thing in the rendering", causing more lag. Gardiner stated these mistakes were an unintended result of the large amount of creative freedom the developers had, allowing them more time to include smaller details after they were finished with assigned tasks.