What is Reddit's opinion of The Real Mad Men of Advertising - Season 1?

From 3.5 billion Reddit comments

I saw a show called The Real Mad Men of Advertising, which showed advertising throughout the latter part of the 20th century. On it, Matthew Wiener mentions that the Coca-Cola ad at the end is a non-obvious cue to the viewer that Don returned to McCann-Erickson (since Coca-Cola was a client of theirs.)