The chorus singers for this song read like a who's-who of 1960s rock and pop:
In the intro, the trumpets play "La Marseillaise" In the outro, the Bach trumpet duet is from the opening of the "Two Part Invention in F Major"
Two "non-sequitors"--John suddenly says "Yesterday," and Paul follows this up with "She loves you, yeah, yeah, yeah"--either total nonsense or conscious self-reference (not a surprise if one considers "Glass Onion"). One guy tried to tell me that what is yelled is "Yes he's dead... We loved you," and the we were the Beatles singing to Paul, Paul being dead and this really being William Campbell. Yeah, whatever.