Hillary's Mistakes?

This report (Time - The Five Mistakes Clinton Made) reviews the mistakes that Hillary Clinton has made in her campaign. It will be interesting to revisit this in hindsight (and after books have been written) to see how accurate it proves to be. Some of the mistakes seem wildly improbable, like this assertion that one of her key aides was not familiar with how the Democrats apportioned delegates:

As aides looked over the campaign calendar, chief strategist Mark Penn confidently predicted that an early win in California would put her over the top because she would pick up all the state's 370 delegates. It sounded smart, but as every high school civics student now knows, Penn was wrong: Democrats, unlike the Republicans, apportion their delegates according to vote totals, rather than allowing any state to award them winner-take-all.

Even if we are to assume this is correct, and that Penn didn't know this, how is it that a savvy political operative like Hillary didn't know this, to say nothing of Bill? I suspect that this report is erroneous and later insider revelations will confirm that, though to be sure, much of the rest of the analysis of her mistakes appears to be on the mark.