Yeah, Season 4 was the last season to have many noticeably unique styles. You have Fear of a Krabby Patty with its own unique expressiveness.
View attachment 14244Have You Seen This Snail is also different with Patrick and Spongebob’s slightly odd body shapes/faces.
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The Lost Mattress, Krabs Vs Plankton and Shell of A Man all look like Season 3 episodes.
View attachment 14237The other early to mid season 4 episodes have a slightly more expressive style mostly using Spongebob’s bold eyebrows.
View attachment 14243 You have a few episodes that kinda use a mix of at least the Season 3 and Normal 4 styles like Good Neighbors and Mrs Puff You’re Fired. Additional to that there is also the late Season 4 episodes, starting with Hocus Pocus, that are even more stretchy and off model.
View attachment 14242Honestly the most diverse season art style wise (even more than Season 2) and is honestly one of the reasons why it’s so fascinating and doesn’t feel modern or classic (though I feel it leans a bit towards Pre Movie as it plays out like a more fast paced Season 3 with animation usually about as expressive as the movie).