Seems the thing that broke the Beatles up was not really mentioned ...
First, during these the time of this documentary, John was already talking about leaving the band to Brian Epstein. Then George did his walk-out. John was clueless and got taken in by Allan Klein, but McCartney didn't like Klein, and wanted Linda Eastman's relatives to manage the group.
The group did not like that. The final thing was that McCartney felt he had to sue the group to break up.
Then later at some point - after the group broke up, and after Klein screwed up the tax status for the Concert For Bangladesh they group dumped him.
I don't know if we'll ever really know what happened, but it might be that John was the leader of the band, and maybe did not like sharing or losing power to the more hard-working McCartney. John did not understand practical stuff, which accounted for his need for Yoko Ono who was very practical.
If I had to guess I'd say the problems arose from John, but not really purposefully or consciously ... it just seems like he didn't really know what he was doing, and at this time he was having his Lost Weekend where he went crazy and got in fights and heckled performers in NYC nightclubs.
It is kind of a cheap shot, or maybe just a different drama put out there in this movie to sell tickets.
I saw the movie, and to me who the Beatles were really the first music I ever heard thanks to my parents being young and Beatle fans. I always liked the Beatles, and they meant a lot to the generation who was around to hear them on the radio first. This is not a good movie unless you have some emotional attachment to the Beatles.