You're a good sport. Good luck with the film. I think the tragic arc of Brian going from the man who "made" the Beatles to an irrelevant (although well remunerated) part of the operation is truly sad. Also, the whole gay show business underworld of the 60s (that John Lennon talked about) was important, if glossed over, part of the Beatles success.
Finally, you have that fateful moment when Brian first walks down those Cavern stairs. Slo-mo, into an underground, dank, smelly prole place, not really his type of people or music, and he sees John Lennon . . . .
We keep coming back to that same scene--walking down stairs . . . .