Because Hello Bikini Bottom! was shipped to Korea so late, you could tell that they cropped some scenes to 4:3 on purpose due to the fact that it was produced alongside some HD episodes:
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The cinematography is really bad in some parts of the episodes too:
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Also the final instance of palebob in Spongebob history, due to it being the final SD episode to be shipped to Rough Draft Studios:
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Again, very bad cinematography in this shot, possibly due to them cropping the episode to 4:3 on purpose to keep it consistent with the rest of season 8.