Um, the mistake is you didn't include the second "the" (and therefore, there is no mistake, thus killing the meme)?
This is the color spectrum in order. The 9 is the wrong color.
Roy g. Biv is the spectrum. red orange yellow green blue indigo violet (as we were taught in school aeons ago). Wouldn't the 5 be the wrong color? the 9 might represent infrared? Cyan wasn't in the list I learned.