The original, and rejected, animation for the first episode of The Simpsons. James L. Brooks famously hated the style so much (”this is shit”) that the show was nearly canned entirely.
It’s worth noting that, at the time, The Simpsons represented what was basically a new art direction in Western cartoons; it was neither the hyper-rubber style of Looney Tunes, nor the pseudo-realism of Disney, nor the stiffness of Hanna-Barbera. The style looks unremarkable now because, like, The Simpsons (not to mention Klasky Csupo, the original animators who went on to shows like Rugrats and… basically the entire Nickelodeon “look”) is a million years old and a pop culture icon. But at the time… well. There were teething issues.