Conversation so far:
How was the song Hey Jude composed?
McCartney's melody over the verses borrows in part from John Ireland's 1907 liturgical piece Te Deum, as well as suggesting the influence of Save the Last Dance for Me.
How is the song Hey Jude structured?
Hey Jude begins with McCartney singing lead vocals and playing the piano. The patterns he plays are based on three chords: F, C and B♭ (I, V and IV).

Question: what is an interesting feature regarding the structure of the song?
Self-contained rewrite: What is an interesting feature regarding the structure of Hey Jude?