I used to read his books as exercises in critical analysis—how does he get from the data to these conclusions, and what does he ignore that doesn't fit his conc

I used to read his books as exercises in critical analysis—how does he get from the data to these conclusions, and what does he ignore that doesn't fit his conclusions? Then I discovered that, as stated by Carl Sagan, von Däniken also relies on factual errors in his arguments.