Nice analysis ashc!
The Dmin -> Fmin is what we discussed a while ago, can be called a chromatic minor third passing chord.Originally Posted by ashc
Gmaj Amaj Dmin is IV-V-i in D minor. These two major chords can be found when you harmonize the D melodic minor scale.
Fmin Gmaj Cmin is iv-V-i in Cminor, tying the chorus back to the verse again.
There are loads of chords that stem from the three minor scales (natural, melodic and harmonic minor). You can even get chords from the extra minor modal scales (dorian and phrygian (aeolian has the same notes as natural minor)).
Attached is just some of the chords from A minor related scales (scales with A C and E)
I couldn't get the formatting correct enough to post it.