We really enjoyed Hendrik Handloegten's 2000 film, which uses fandom and the old Paul is Dead mystery trope to great effect in a coming-of-age story. Tobias maybe has some stuff going on at home, and at 13 is on the cusp of noticing girls, and the film perfectly shows how kids get obsessed and wilfully believe outlandish things because the fantasy is more appealing than reality.
We go down the rabbit hole of the Paul is Dead theory ourselves, and ask: is there anything in it? (No, no, there isn't.)
Links
There are other versions of the film online, but this one doesn't cut out the music
Some songs from the Paul is Dead novelty subgenre: The Ballad of Paul by The Mystery Tour
The appalling The Last Testament of George Harrison (Paul McCartney Really Is Dead)
See also

Paul is Dead (2018 British short film)
A British short from George Moore: the Beatles wake up after a drug-fuelled night to find Paul McCartney dead, and try to recruit a replacement, Billy Shears.
