Does anyone feel that the Flintstones jumped the shark in the last two seasons, I don't think it did but it did seem to be aimed more at a younger audience at the point when Pebbles and Bam Bam came along in Season Four. There are some good moments in Seasons Five and Six with some good guest stars such as Elizabeth Montgomery and Dick York lending their voice talents in one episode when they guested as the characters they played in Bewitched.
I think its safe to say that the first three seasons were the funniest as the plots were the same as adult sitcoms of the period. It was initially shown in a primetime slot in its early years.
My all time fave eipsode is "The Twitch" which cashed in on the twist craze.