User blog comment:Nick D Wolfwood/Manga vs Anime for canon material/@comment-2175271-20100825014654

I think this depends a lot on the individual. For most of us, anything that is stated by Hoshino herself is considered as original canon material. If she happens contribute to the anime fillers, I think we can consider that as canon too. The bigger problem here is we do not know how much does she contribute or approve to the filler and extra moments in the anime.

For some people, as long as the anime canon doesn't contradict the manga canon, then it can be accepted as part of original canon.

For my case, I prefer manga and novel canon (the novel because it was co-written between the Kizaki and Hoshino, and Hoshino herself said that Bak was their creation together). As for the anime, I usually go for selective canon--if they are just short scenes used to flesh out the characters and motivation, I would consider them as canon. But if it is the introduction of new Exorcists like Mei-Ling, then I'll just ignore it.

As for the scenes that you've mentioned, I don't think they directly affect the progress of the manga, and they are more like backstories or side stories. But if they were to be included in the wiki articles, then it would be best to place them in a separate section (like how the Bleach wiki does).

Hope this helps.