They aren't typically the kind of thing a winery includes in its labels or promotional materials--mistakes, that is."We drank our worst mistakes, so hopefully nobody had to find out about them," jokes Julie Garvey, co-owner of family-owned Flora Springs Winery in St. Helena, Napa Valley.For obvious reasons, mistakes can be a touchy subject, one about which winemakers don't exactly line up for interviews. When they do speak about them, though, they sound common themes: that American winemaking ha...