For those that don’t know, “supplemental results” are the bane of search engine optimization specialists.
Here is a great explanation of supplemental results from Rockyfied
Google Supplemental Results: Google supplemental results take pages on your site that have been indexed and put them into a sub database in Google. Supplemental results do not rank well but rather Google uses its supplemental DB to populate its results when they donâ€™t have enough results to show in a given query. This means pages on your site in Googleâ€™s supplemental DB will not help you in the serps.
Matt Cutts has mentioned there is a pagerank export in progress.
Pagerank reflected on your toolbar has no effect of your search engine traffic, as the pagerank used by the various data centers is different to that used for your Google Toolbar. Toolbar OageRank is just historical data, often up to 3 months out of date.