This article made me go back and pull out my first season episode (show #120, IIRC) to recheck the category variety. First round was World History, Birds, Dining Out, Football, Auto Slogans, "Boys" in Song (ADD here, not surprisingly). Double was Shakespeare, Notorious, Photography, Vaudeville, The Bible and Word Origins. First round may be a little more skewed toward pop culture but overall it seemed pretty well balanced to me.