When player A has the butterfly renaming balloon open, and player B quickly renames it while the player A is still not finished typing, that butterfly will become bugged.
Result is after player B renames it, it will no longer be renameable by anyone other than player B - even if player A clicks the 'tick' on the already opened balloon on his screen.
Not an exploitable bug but just for dev's info. I did not test other types of animals.