In an episode the Who is Leader X, two of the Galactor goons sent to fetch the scientist who built the cyber horses, well they look a lot like Doronjo's 2 bumbling goons.....only more detailed. And nearly 6 years before Yatterman was aired.
I also noticed the Mach 5 among the cars in the race track in the poignant ending scene of Joe waiting for the(spoiler) blonde racer/Galactor agent he killed (who later is revealed to be his childhood buddy's fiance) he promised to race with the previous day after rescuing her from a car wreck in the Plan to Assassinate Dr. Nambu.
Talk about a convoluted, operatic, melodramatic plot for teenagers 40 years ago (hats off to the writers back then).