"In Spite of All the Danger"

I listened to Anthology 1 yester-day and noticed a small feature in "In Spite of All the Danger."  Lennon starts singing each verse alone but is joined by McCartney at the end of the first line, so "In spite of all the" is sung by one voice and "danger" (or "heartache" in the second verse) by two.  This arrangement (with "danger" and "heartache" sung by two voices) provides a sense of that "all."