[link to original on tumblr]
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Whoa oh, I never realized what a kiss could beAt first, I thought that this was just a really minor lyrical phrase that connects those two songs, but then I got wondering about the musical phrase that accompanies it.
This could only happen to me
Can't you see, can't you see
The "whoa oh, I" in "I Should Have Known Better" alternates between E and F# before falling to a D. The "whoa" and "oh" each have an E and a F# (the "oh" has a melisma so it's two syllables), and the "I" falls on a D.
The "whoa oh I" in "When I Get Home" has most of this same phrasing (although I think it's an octave higher). As in "I Should Have Known Better," the "whoa" has an E and an F#. The "oh" is only one syllable here, but it's still an E. The "I" is higher though; here, it's an A.
[Disclaimer that I could very well be wrong in those notes.]
So that short phrase helps to tie those songs together lyrically and musically.