Thread:Nerdfightergirl/@comment-4287993-20131214203428/@comment-4287993-20131214204549

So, I'd say:

The broadcast episodes provide canon information. As long as it's not contradictive with the episode, information from deleted scenes, promotional photos and the writers' Twitter accounts are canon too. Basically, as long as the information comes from official sources (the list above), I'd say it's canon. Deleted scenes should definitely be included I think, as they can provide some extra information, and as they were part of the script, I'd say they are official. The website of Grey's Anatomy can be used as a source of canon, but we have to keep in mind that the information is old, so the TV show totally trumps the site.