"Minstrel's Song"

I listened to Live at the Isle of Wight Festival 1970 this afternoon, and then I figured out the chords for "Minstrel's Song" (referencing the studio version) and noticed an interesting feature.  The song is in C major, but for the "Ev'rywhere love is all around" section, the chord progression includes a D major (with a F# accidental).  Musically, this accidental illustrates the "ev'rywhere" and "all around."