[link to original on tumblr]
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After practicing it, I noticed that one phrase sounded familiar to me. It's the phrase that links the chorus to the next verse (although it's different between the second chorus and third verse):
Excluding that first half note, the notes here have the same intervals (and at least a similar if not the same rhythm) as a phrase in George Gershwin's "Someone to Watch over Me," specifically the line, "There's a somebody I'm [longing to see]." I don't think I've come across anything that says that the Beatles even knew about Gershwin, much less quoted him, so I think this melodic similarity is just a coincidence. Still, I thought it was interesting.