Dear Friend Lyrics

Lyric discussion by Digi-G 

Cover art for Dear Friend lyrics by Paul McCartney

Care to elaborate what makes it a stab at John Lennon? I've always heard that, but the lyrics are vague enough that it could be about anything or anyone. What do all of the questions in the song mean?

The second verse "Dear Friend throw the wine, I'm in love..." seems to say "be happy for me, I'm in love".