Footnotes like that are a horrible idea from usability point of view. This is a wrong medium. Don't we have some kind of spoiler tags?
Well, if you read the gwern.net version, I have a neat Jquery hack which 'floats' footnotes at their original location in the text; is that better?
This essay exists as a large section of my page on predictions markets on
gwern.net: http://www.gwern.net/Prediction%20markets#1001-predictionbook-nights