Board Thread:Questions and Answers/@comment-1894786-20200201171722/@comment-27756454-20200207080910

I'd personally like to believe that everything is canon except for Mystery Incorporated, Be Cool, Scooby-Doo goes Hollywood, SCOOB!, the theatrical films, the CN films, Daphne and Velma, Lego Scooby-Doo, the puppet film.

There are certain things that for many are not canon but could be easily squished in there with a little imagination such as the Laff-A-Lympics or the Arabian Nights film. Also, I still believe Get A Clue is not part of the original continuity but it seems like the admins didn't find any inconsistencies so they count it as part of it (I still have my doubts about that though), the same with "The Mask of the Blue Falcon" movie because they met the real Blue Falcon in the classic continuity but it could easily be fixed by saying there's a real one and an actor.

There's also things I'd love for them not to be canon, such as Return to Zombie Island :)

Hope this helped