The opening chord of I'm Only Sleeping is simply brilliant! The one on which John is singing 'When' (I wake up early in the morning).
The ringing guitar intro to "If I Needed Someone"
The crystal clear little "ping!" at the end of the guitar solo in "Nowhere Man"
The spangly guitar outro to "A Hard Day's Night" (Oh how I've often wished they'd based a fresh song around the sound of that wonderful fade out!!)