Factual error: At Watkins Glen 1973 there is an accident during practice. That is correct, but Cevert's Tyrrell did not go under the guardrail. It landed on top of it after the crash. In 1974 Helmut Koinigg went under the guardrail and was killed, so this seems to be a hybrid of those two accidents. (00:21:40)
Other mistake: The Rolls-Royce at Watkins Glen, and the Mini in England, have the same English license plate.