The cast distribution was done smartly, each actor corresponding perfectly to their characters. The soundtrack was discreet and avoided a big sing along, which is a blessing.
The only thing that could be thought of as negative was the technology limitation at the time. The colors are a bit stiff, lacking a bit of shadowing and lighting, but it's really minimal, certainly not enough to distract from this quality piece.
I highly recommend it unless you're not interested in animation at all.