There are small bunnies hiding in the bushes in some rooms. They'll pop their heads out if you are close enough to the bush and happen to click on it.
I'm glad you liked it, and I'm also glad you didn't encounter any bugs!
(I'm sure the bug is still present in the game, it just doesn't happen on all devices. I couldn't reproduce it on ~10 devices available to me, which makes it tricky to find and fix)