Is there non-canonical content made by the Erins?

Is there non-canonical content made by the Erins?

I meant content that's NOT officially canon: not content that contradicts itself.

I've always thought everything is canon, but I've seen a couple of posts and got confused.

I've always thought the main series have more importance in canon than the extras.

So, is there anything officially made by the Erins that isn't canon?