Pure speculation, but maybe someone at Hanna Barbera? I know Hanna Barbera did the Whew! opening. I noticed many of Jay's productions had animated intros, including Shopping Spree (MG 98's original intro was not animated, but certainly was in the style of animation. While I thought the MG 98 intro was a little too long, I liked how the set pieces dropped in place onto an empty studio 33.)