This doesn't directly address the accuracy of the history as it's told in the series, but one important thing to make clear to your children before they watch it is the distinction between the history, told through dramatic reenactments, and the talking-head analysis spliced in throughout. Most of the people brought in for comment are modern-day businessmen/entrepreneurs/investors (Donald Trump, Mark Cuban, etc) who speak from the perspective of the tycoons profiled in the series, and are therefore more likely to be biased in their favor with their comments.