That's a possible solution. Meanwhile I have been thinking I will need to refer more explicitly to the text in my comments so the SMEs know which part of the page I am referring to. It's frustrating though and I wish comments had a leader line linking them to their content.

Agreed. In normal circumstances, the associate content is highlighted a deeper yellow when you click on a comment box, but this doesn't always work when you have an item with lots of comments on it, and the page itself becomes slower to operate. It would be better if comments worked in a similar way to Microsoft Word's commenting system, i.e. highlighted content with a speech bubble symbol next to it, which – when clicked on – loads up the comment. That failing, the comments could be collapsed totally by default to just the heading bar of author, date/time, etc., then expanded – and content highlighted – when clicked on.