As the last repetition of "As I write this letter" is sung, John, Paul and George (in that order) take turns in singing responses. They also do this in "Young
Blood" ("Look 'a there" and "What's your name?"... first George, then Paul,
then John: see the "Beatles at the BBC" release) as well as "Three Cool Cats"
(see "Anthology I")
Paul McCartney has included "P.S. I Love You" in concert appearances
throughout the late 80s/early 90s as a reggae mutation of "Love Me Do" and
"P.S. I Love You" which he called "P.S. Love Me Do".
