the interpretation of the Abbey Road album cover as depicting a funeral procession. Lennon, dressed in white, is said to symbolise the heavenly figure; Starr, dressed in black, symbolises the undertaker; George Harrison, in denim, represents the gravedigger; and McCartney, barefoot and out of step with the others, symbolises the corpse.[15] The number plate of the white Volkswagen Beetle in the photo was identified as further "evidence",[9][39] the characters "28IF" representing McCartney's age "if" he had still been alive.[20][nb 5] That the left-handed McCartney holds a cigarette in his right hand was also said to support the idea that he was an imposter.[18]
On the other hand a real mystery that will probably never be solved is who the girl on the back cover is or was. This is the photo used without the album credits.
Thanks for the explanation. It all makes sense now.