There's one debate ubiquitous to every Japanese cartoon and comic that's been released (as well as several other western franchises): which parts of it are and aren't "canon". Some cite comic books as being the "true canon" for later adaptations (and so anything that doesn't match it is "non-canon"), others cite the original creator's work as being the "true canon", and others still just say something they don't like is "non-canon".
However, this phenomenon seems to be almost entirely exclusive to western fans. In Japan, they just accept the stories as what they're meant to be (amusement), without concerning themselves about what is or isn't "canon". Why can't western fans do the same? What drives you to obsess over an insignificant aspect of the story that the cartoon creators themselves don't even take seriously?