Sidenotes / Inline notes on nodes I was wondering, is there already a module making it possible to make inline or sidenotes/comments inside the content of a node. A good example is the notes you can add in Google Docs.

Would be great for editorial purposes!
If I am not mistaken, it seems you want to have something like "private comments" on a node. You can find some information in the following question: How to have separate private comments for nodes apart from the general comments? 

It mentions the Reply module, which is still in alpha. There might be other similar modules.

Hope it helps,