Looking at the development drawings, I love how they have kept the original drawn character designs and applied them into the CG look; giving the piece a classic Disney feel while you watch it, while using advanced technology.
To animate in this way, you have to apply key frames so that the in-betweens can work out themselves. This is demonstrated in smiley faces during this sequence:
I would like to look into applying traditional animation into computerised technology in the future, to develop my skills and keep up with the 'modern times'.