Fan Nickname: Fans of the girl squirrel have nicknamed her "Hazel".
The Other Darrin: There were no less than three different voice actors for Arthur. And it was very noticeable. Two sound very similar: young and squeaky. While the other is the voice of a teenager who's gone through puberty. Two of which sound a lot like Mowgli or Christopher Robin. While neither of them voiced Mowgli or Christopher Robin, the older one did. Two of them are also animator/director Wolfgang Reitherman's sons.
Write Who You Know: The animators based Merlin on Disney himself, noting that they were both cantankerous, argumentative, but brilliant and ultimately lovable.