Love This Thing:
I'm not a Don Knotts groupie by any means (when I read posts like 'these are my top 3 Don Knotts movies! I wonder what is wrong with these people. :D )
But to me, this is utterly charming in the same way Mary Poppins was. (Maybe it's because Knotts doesn't act all hysterical as he does in everything else.)
Anyhoo, there was a lot of crap back then that looks dated as hell now, but I think this totally holds up.
I can only imagine how terrible any remake would be.
What I really like: they don't even bother to explain -how- he 'transforms'. In the remake they'll probably come up with some elaborate 'kid-friendly' explanation involving 'magic spells' or an iPad app.