Sneaky Lying Cheating Giant Ninja Koopas - S1-E2
Other mistake: When Cheatsy and Kooky suggest the kingdoms the Koopalings should take over next, their nostrils disappear. (00:08:18)
Other mistake: We know the girls all go to school together, but when they are walking home in the opening scene, they all meet up coming from different directions.
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Suggested correction: They don't approach from very different directions. All of them are still basically in the same area of lawn and trees. This is possible depending on what they do after exiting the school building. Maybe someone walked in another direction so they could briefly talk to other friends, etc.