Cuckoo

Since you all had been curious about the cuckoo, I went back and checked what happens at the full hour:

First the right door opens and the cuckoo comes out - you really need good eyes to spot it since it's quite small considering that the clock is so big (but if you don't see it, you definitely hear it!). Then afterwards there's some music playing and little puppets start to "dance" after the door on the left opens.

Click here for a photo of the large Cuckoo Clock.