A lot---mostly little. He gets names, dates wrong. My biggest problem with his interpretations deals with economic issues. He still blames the Great Crash on "overspeculation," despite a lot of economic evidence to the contrary. He doesn't tell a very consistent economic story, if you will, beginning with the 1830s, where he misses the Bank War.
I think he misses the real significance of the 1950s; and, of course, stops sooner than we do.