I used to skip over this song and dismiss it as a throw-away, but after a long listen on the headphones one evening, I was convinced it's one of the better songs they ever RECORDED.
One thing I did note was the abundance of George Harrison fills and licks, something that Paul McCartney and to a lesser extent, George Martin would frown upon duing their whole career. From reading all the material about the Beatles history, it's no secret that George, a guitarist first, felt more stifled not being able to play parts the way he heard them on Beatles recordings. On OG, it's clear he does what he wants and I believe he turned in one of his finest performances on a Beatles record.
The lead part especially is a happy, bouncy, well thought out and executed solo and the interplay in between and during the lyrics is perfectly woven through with little overplay. John's "Donovan" finger picking is a perfect compliment to the song, but what else would you expect from the worlds greatest rhythm player?
Paul does his part on bass and the added background vocals from Paul and George sound youthful and slightly majestic at the same time.