Now when I run the following query: http://localhost:8080/solr/mlt?q=id:neardup06&mlt.fl=features&mlt.mindf=1&mlt.mintf=1&mlt.displayTerms=details&wt=json&indent=on
try adding: &debugQuery=on to your query string and you can see why each document matches...My guess is that "features" uses a text field with stemming and a stemmed word matches
ryan