Glenn Greenwald counts the ways:

Despite the fact that it's only 74 words, one could spend hours highlighting the factual inaccuracies in McArdle's “uncomfortable question.” The point isn't that what she said is wrong. Everyone makes factual errors. There's nothing wrong with that. It's that there is no way to think or write any of what she wrote if one has been paying even the slightest attention to these matters, and if one hasn't been, then one shouldn't be writing about them