The lineup of historians, biographers, and journalists added context to what was being dramatized. But in addition to these talking heads (and the amiable NASCAR drivers obviously trotted out for their "star" value), it would have been nice to hear from "witnesses" with first-hand or family knowledge of some of the personalities and events described. It's not like these people don't exist, especially in the Detroit area. With a little digging, the producers could have found retired factory workers, designers, executives, union organizers, etc., or their children and grand-children, as well as the offspring of auto pioneers. It also would have been a treat to see more of the actual Motor City (many of the sites associated with the story still exist) instead of whatever stand-ins in Texas and New York were used. The real homes of Henry and Edsel Ford are still around, for example, as are many factories and other historic sites.
I don't know if Car Week is now "a thing" on History Channel, or if a second edition of "The Cars That Made America" is planned. If there is a follow-up series, I'd like to see it concentrate on some of the many characters and cars either entirely left out of the first series or given short shrift, such as Ransom Olds, Henry Kaiser, Studebaker, Nash, Harley Earl and the Corvette, etc. And I hope they spend a few bucks on a reliable researcher in Detroit.