 The harmonic fascination with the bridge segment beginning "I want her everywhere" is that at that point the key centre does go "everywhere".It shifts via an F7 chord (a VII in the old G key and a V7 in the new B key) to a I–vi–ii (B–Gm–Cm) chord progression in B major.It then shifts again via a D7 chord (a III7 in the old B key and a V7 in the new Gm key) to G minor where we go through a i–iv (Gm–Cm chord) progression.