The many animators of the Flintstones...

(Click here for Link)

I found this quite interesting -- other people may not. But apparently they had a number of different people who animated Fred & co. at different points, and each one drew and animated the characters in their own style. Normally, this is discouraged (at best) I think it added some character to it, though I never noticed at the time.

(as usual, click on the title for the link... and this is probably the last time I'll mention that)