Every team in college football faces controversies. Most of the time the controversy centers around the officials—notice the word "most."
While it's true that an official's or group of official's call is the center for most controversy in college football, other controversies emerge as well. It could be a coach's call, a result of a game (look up Harvard Beats Yale 29-29 by Kevin Rafferty) or a dispute in who is leading in the series.
Like most schools, Nebraska football is not immune to controversy. In fact, the Cornhuskers have faced their fair share of it over the years.