Americans Hate Tingle: Though the show in no way awful, and has sustained a rather small American fanbase, it's virtually unknown outside it's native Europe.
Critical Research Failure: In "Round Up the Usual Suspects" Macbeth has hidden camera footage stored on DVDs, yet the footage has tracking lines like on VHS.
Fridge Horror: In "Back to the Past" after discovering the true identities of INK, Macbeth goes back in time and wipes them each from existence one by one. Exactly how she erased them from existence isn't exactly made clear- Macbeth just mentionstracking down their parents!
A French animated series about a group of kids at a boarding school who lead a secret double life fighting the forces of evil? With a kid genius and a girl associated with Asian culture as two members of said group? Nope, can't say that sounds very familiar.