I thought that the video was interesting because it is rare to see pictures (let alone footage) of the Rebbe that were taken before the 1980s. Almost all the pictures that we see plastered over everything were taken in the last few years of his life.
What struck me as interesting is that no one in the video is wearing the wide brim hatmobile that we associate with Chabad today. Today the Chabad dress code is extremely rigid, A Fedora with a very wide brim often worn with a long “frock coat" and of course an un-trimmed beard.
In contrast in the video Most people (including the Rebbe) are wearing hats with much smaller brims, a few are wearing homburgs, and many are clean shaven.
I know that when Chabad moved to America they replaced their Chassidic Shtreimel with a more modern American Fedora. But at some point since the 60s they decided to codify their uniform with a much more distinctive look (although not as destinctive as the elaborate dress code worn by other Chassidim)
At what point in the last 30 years did Chabad adopt the hats and jackets that we see today? Who made the decision?