The term continuity error refers to a broad sprectrum of mistakes which can occur in the production of fictional media, which break the established continuity, or consistency of events being presented. Although continuity errors are more prevalent in live-action media, they still occur quite often (perhaps too often!) in animated cartoons and comic books. Common errors in the various Transformers media may include characters designs changing from appearance to appearance, or characters showing up where they shouldn't be. And don't even get me started on the Generation One Constructicons. That's a whole barrel full of headaches, right there.