You would have missed it at that age. The show was only broadcast from 1965-1969. It wasn't rebroadcast in syndication until the late '80s.Wow, I seem to have totally missed these...and I was at prime cartoon-watching age in 1975. Maybe I was beginning to phase out of Saturday morning cartoons by then; who knows. But I don't remember them. I was all about The Bugs Bunny Show, Fat Albert, Scooby-Doo, Hong Kong Phooey.....but I just don't remember a Beatles cartoon show.
It was in the outro on each episodeI vividly recall watching these episodes as a kid. One specific scene I recall was John, Paul, and George unplugging their guitars, followed by Ringo unplugging his drums, which then proceed to deflate like a beach ball. And this was well before the advent of electronic drums. Unfortunately, I've yet to come across this scene in any of the episodes posted online.