I've noticed that some posts (such as http://what-if.xkcd.com/110/) don't display footnotes correctly. Feedbin will show the footnote content immediately after the [1]: but the original post has it in a popup when you click:
Yeah this is an issue with xkcd. The footnotes on the web page use JavaScript to hide and show the content but no JavaScript can be passed through RSS so the content is always visible.
I've noticed that some posts (such as http://what-if.xkcd.com/110/) don't display footnotes correctly. Feedbin will show the footnote content immediately after the [1]: but the original post has it in a popup when you click: