I watched this show in 1969 when my father was stationed in Bangkok and the family relocated. I didn't like it. I loved it. And I can still hum the Banana Splits theme song. The part I enjoyed a lot was the write-in letter for Dear Drooper. He would always come up with the zaniest reply. To a writer, amazed that the light from the sun travels 86,000 miles per second, he replies, "Don't forget, it's downhill all the way." To a safety conscious student driver, he replies, "The most dangerous part of the car is the nut holding the steering wheel." I still have the tape recording (monoraul audio) I made back then. This is part of my childhood and my early lessons in humor.
