As a fan of alternate histories of various stripes, there’s nothing more disappointing that a story that imagines a world where history went differently, but almost everything is still exactly the same. The whole point of the concept is to have fun extrapolating the changes. On the subject of Beatles-themed alternate histories, Ian R. Macleod, one of my favorite sf/f authors working today, wrote a novella back in 1992 called “Snodgrass” which imagined Lennon leaving the Beatles in 1962 over a fight with a studio executive, only to spend the rest of his life being haunted by the road he never took. It was eventually adapted as a short drama a few years back with Ian Hart as a bitter Lennon in his fifties.
… there’s no attempt to have fun with the Twilight Zone possibilities. There’s no humor about the “butterfly effect” in erasing the Beatles from the world they changed. It’s a parallel universe where Coldplay and Neutral Milk Hotel exist without the Fabs, and where all the men have longish haircuts that would have been unthinkable before the mop tops came along. As British critic Dorian Lynskey noted, “‘A world without the Beatles is a world that’s infinitely worse,’ says one character, in a film where a world without the Beatles is almost exactly the same.”
Yeah… I was about to make the argument that you can’t make a movie where everyone save one schlub “forgets”: the Beatles without re-imagining a musical climate in which the Beatles, arguably the biggest pop band of all time, nor their inevitable influence, never existed, but apparently this is too pedantic for Hollywood.