Footnotes and Endnotes Are there any plugins or best practices for giving authors in Craft the ability to create footnotes within a Rich Text Field? Is anyone doing anything like this?
I don't know of a solution for footnotes within Rich Text fields aside from the plugin referenced in the comments of the question. As an alternative, consider having a read over Craft Your Content With Markdown And Matrix by Stephen Lewis.  He explains how he handles footnotes using Matrix and smartdown.