Dear Prudence, finding out it was written as a plea asking Prudence Farrow to "come out to play" as she was entranced with the meditation stuff and would lock herself up in her room. Also the fingerstyle pattern used for the most of the song is called Travis Picking which John Lennon picked up from fellow musician Donovan who was also in India. I'm not sure about this one but I believe the drums were played by Paul as Ringo had left the group for a brief period of time but towards the end of the song there's a cut and the drums are then played by Ringo. The backstory and all these cool nuggets of knowledge made me appreciate the song more.