I’ve noticed that the animation in Season 3 moves pretty similarly to how WB cartoons did in the 50s, whereas the animation in the newest SpongeBob episodes has very fluid movements that are more like Tex Avery’s MGM cartoons and the older, pre-1943 or so WB cartoons (Bob Clampett, Tex Avery, and Norm McCabe come to mind). Like, the pre-movie animation isn’t bad, but it definitely has a more “controlled” and slower feel to it and it’s not as smooth, whereas the post-sequel animation is buttery smooth.