[link to original on tumblr]
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Like "Listen to Me," one of the vocal tracks in "Things We Said Today" shifts between double-tracking and harmony, but I don't think the line "Then I will remember" is double-tracked or harmonized. It's just a single vocal track. All the other instances of that line have first person plural ("Then we will remember"), so the single vocal track mirrors the first person singular pronoun and the loneliness.
While recording the vocals for this, I also noticed the similarities between two lines in the bridge:
Me, I'm just the lucky kindThere are a number of resemblances between the second and fourth lines - "Love" in both, "hear"/"here," and "say"/"stay." There's also a similarity of sorts between "love is love" and "that's enough."
Love to hear you say that love is love
And though we may be blind
Love is here to stay, and that’s enough