Alternative Character Interpretation: The narrator might not be George Harrison. Joel mentioned at the beginning that he wasn't able to confirm that the voice was Harrison's voice. As such, the narrator could be an elaborate troll.
John is Too Dumb to Live because he keeps insisting leaving clues about Paul's death despite it putting himself and his band mates at risk of being killed by Maxwell and his goons.
Critical Research Failure: The car crash that sparked the "Paul is Dead" rumors occurred in 1966. However, the movie claims Rubber Soul was produced afterwards despite being released in 1965.
Designated Hero: John, George and Ringo. They willingly cover up Paul's death to help themselves. Then, the trio are incredibly passive aggressive toward Billy to the point of calling him "Fake Paul" and leaving clues in the hope of making their audience feel the same way. If that wasn't enough, there is their botched attempt to kill Billy and resurrect Paul.
Everyone Is Jesus in Purgatory: According to the movie, every Beatles album, from Rubber Soul to their last album Let It Be, is full of clues about Paul's death.
Moral Event Horizon: John, George, and Ringo arguably crossed this when they take Faul to India to try and transfer the real Paul's soul into Faul's body, doing so will cause Faul's soul to cease to exist. This doesn't work, luckily.
Unintentionally Sympathetic / The Woobie: William Campbell eventually (and possibly inadvertently) becomes one of these; we're clearly supposed to view him as a ruthless, imbecilic and opportunistic interloper, but when you think about it he gives up his entire life to take Paul's place, not only to save the band but also to spare the millions of people who will apparently commit suicide upon hearing of Paul's death, only to be constantly bombarded with mean-spirited digs and references to how he's not the real Paul and how the real Paul was so much better. You can't help but feel a bit sorry for him.
Wangst: John, seriously? We know Paul was your friend, but your quest to include references to his death in everything you do from that point on starts to look a bit obsessive. You've got to let it go.