Fake Russian: Linka's American voice actress, Kath Soucie. "Linka" isn't even a valid Russian name. It could conceivably work as a nickname. You might call a girl named Galina "Linka", for example. But yeah, as a proper name, it's more West Slavic.
Germans Love David Hasselhoff: Australian kids love Captain Planet unironically, and even the snarking over the silliness is more out of love rather than out of "What the hell were we thinking, watching this as kids?" like it is in North America (specifically, the United States).
A lot of Australian children born in the late 80s to very early 1990s will fondly remember watching Captain Planet. Not only was it on the free-to-air channel The ABC, but it was in a perfect timeslot with popular shows on either side of it. Sadly, to the despair of several viewers, the ABC no longer has broadcasting rights.
Hey, It's That Voice!: The celebrity voices were usually played up, but some of them required a more careful ear: for example, Tom Cruise was Captain Planet for the first few episodes before leaving the series.
"Funny Aneurysm" Moment: The HIV-stricken teen Todd was played by Neil Patrick Harris, who did the role for now-obvious reasons (i.e., Harris is gay and the character he played was accused of contracting HIV from unprotected sex with his male friend, rather than a blood transfusion gone wrong). Todd's mother on the show was voiced by Elizabeth Taylor.
Linka is Kath Soucie using a Russian take on her Tiny Toon Adventures character, Fifi La Fume, for her voice. Soucie, like Frank Welker, Jim Cummings, Mary Kay Bergman, and even Tim Curry have a long list of other characters they've played and are famous (notorious) for...and for Kath, this is one of them. And if you listen carefully in "Bottom Line Green", you can hear Prince Alexander.
Fittingly, the German dub had Captain Planet with Dean Cain's regular dubbing voice, thus making him anothersuperhero. Spain, however, has Kwame as the 1948 Superman.
You might not think Verminous Skumm looks like Jeff Goldblum but he's got that look in his eyes that's unmistakeabley his.
Keep Circulating the Tapes: a few VHS tapes containing 1-2 episodes were released a ways back but they are now out of print and very hard to find. Shout! Factory did release season 1 to DVD but never released the rest of the series due to low sales.
A producer was unsatisfied with a number of facial designs for the Captain until one of the artists finally submitted the producer's face as a joke... and to make a longer story shorter, that is why Captain Planet looks like Mr. Boxer (though one would suspect the latter never had a green mullet or the superhero musculature).