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The series had extremely limited animation, produced by xerography: photocopied images were taken directly from the comics and manipulated to minimize the need for animation. The cartoons were presented as a series of static comic-strip images where the only movement usually involved the mouth or the occasional arm and leg.
Here are comparisons of the original Kirby/Giacoia artwork next to screen captures of the cartoon images. The Kirby art is from Tales of Suspense # 63 (Mar 1965).
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In the past, I've seen some comic book fans blame Jack Kirby for the ultra-muscular superheores in modern comics, but I've always said that's like blaming Robert Johnson for rage rock. Kirby didn't invent gigantic men in tights colliding, he just came up with a more dynamic way to illustrate modern superheroes, and while Kirby's work was an influence on many popular comics artists, it's not Jack's fault these types of stories resonate with many young readers.