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| This was one of the last songs John Lennon and Paul McCartney collaborated on. Even though all of their songs were credited to Lennon/McCartney, many of their later songs were written separately. |
| The unique sound of this song was not supplied by an organ or any kind of keyboard. It came from running a guitar through a Leslie speaker. Such speakers are commonly found in keyboard instruments. The speaker rotates, which is what provides the different sound. (thanks, don - rapid city, SD) |
| There is a rumor that McCartney owns the rights to the song "Happy Birthday." McCartney does own publishing rights to a lot of songs, but not that one. |
| McCartney played an upright piano that was rigged to sound like a harpsichord. |
| Patti Harrison and Yoko Ono sang in the chorus. |
