There's a funny video from The Beatles Anthology of McCartney, Harrison & Ringo sitting around with George Martin. They're all listening to some early takes of "Golden Slumbers", the first song of the closing medley from Abbey Road. None of them could explicitly recall who played bass on the track. However, George eventually came to the realization that it was either him or John Lennon playing bass on that particular track since it was a fairly fleshed out set of basic tracks: vocal, piano, drums & bass.
And you've got to love this image of George Harrison playing a Jazz bass. This is very likely from the Abbey Road sessions:
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And you've got to love this image of George Harrison playing a Jazz bass. This is very likely from the Abbey Road sessions:
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