I love that ending shot of Moomin looking out into the night sky. It looks like he was about to break a flute but then he heard Snufkin below playing his guitar. The way Snufkin looks up at Moomin and smiles as he continues to play as the camera panes away I love it.
Yes this is a common thing done in animation to make it easier to draw and animate. I noticed that he only had four here and in other times five. I just love listening to him play. I wish I could just sit next to Snufkin in Moominvalley and have him play.