But I've never heard anyone question its accuracy. (Over many years, for what that's worth.) Acknowledging my biases, I watched that show when I was young, and I'd really loved it.
There's no other show like it. The New York Times reports "It took more than two years to make, was filmed at 150 locations in 22 countries and cost 51.5 million."
https://www.nytimes.com/1979/10/21/archives/pbss-connections...
The important word in my statements above is 'entertainment'.
He also had a monthly 'connections' series of articles in Scientific American for several years. They were very entertaining too.