Disclaimer: I haven't watched the movie or heard the song.
From the notes alone, looks to me like Em, F♯m, and Bm. Those are all diatonic to B minor/D major, and in B minor, that's a vi-v-i progression, supporting my claim, as that's a common progression in minor.
I wouldn't call those 6th chords. I mean, just based on the notes alone. Even if the first chord had a D in it, it might be better as Em7 than D6. But that would be based on how the chord sounds/functions, so maybe they really are 6th chords voiced incompletely. Just having the G in the bass is not enough to guarantee that the chord has that as its root; this is why I tend to avoid reverse chord finders. The human ear is infinitely more precise in its analysis of that kind of problem.