Missing Episode: "Return, Our Scorponok!" was never translated or broadcast in America. This changes the audience perception of Scorponok entirely, as it is revealed that he is not actually Alpha Q's servant from before the planet's destruction, but a Decepticon with Fake Memories. The real Scorponok died when Planet Q exploded.
The loss of an episode that both explained a lot of things and was a major turning point in the series rendered a lot of events meaningless or confusing. No one's sure why it was left out.
Old Shame: For many of the actors, but Brad Swaile (the voice for Kicker) in particular.
Schedule Slip: So bad that the US adaption got incomplete sequences missing animation.