Yes, most interesting. I've been watching EPL for only 4-5 years, and knew nothing of Leeds, much less Derby.
I have watched a bit over half of it, but it seems to me he's portrayed as a pompous, sometimes nasty, genius. Lots of Chutzpah, too.
Brian Clough was a definite one off. No manager before or since had the gift of the gab like Cloughie. He was confident in his abilities and to say he was full of himself would be an understatement (his nickname was old big 'ed), but he could back it up. He won the first division (now the Premier League) with Derby, who are a smaller club, then he went on to win the league with Nottingham Forest AND back to back European Cups in 1979 and 1980.
Below is a funny little clip from a football show from 1974 where Cloughie was a panelist. The legendary Muhammed Ali sends Brian a video message telling him to be quiet as there's only room for one great talker.
By the way I'm glad you seem to be enjoying the movie jpmcwjr?.