I see the new book repeats the oft-repeated mistruth about the Z's "debut": "Datsun formally introduced the car in New York City on October 22nd, 1969, following that with its Los Angeles debut two days later with the same car."
In fact, Nissan had formally introduced the S30-series Z range (not just one variant...) to invited press, dealers and key suppliers at their Ginza, Tokyo head office and showroom on October 18th and 19th 1969, as a preview of the new cars before the general public would see them at the opening of the Tokyo Motor Show.
How does the New York Pierre Hotel event on the 22nd trump the Tokyo Ginza showroom event on the 18th? Both were private, invitation-only events for the same types of attendees. If the Pierre Hotel event counts as significant, then so should the Tokyo, Ginza event. And the Tokyo, Ginza event happened FIRST.
The REAL debut - the public debut - of the new S30-series Z range was on 24th October 1969, at the Tokyo Motor Show. Over the course of two weeks more than 1.5 million visitors would pass through its doors: