That's pretty much the whole song. It repeats with subtle variations. For example, the very first beat of the first measure is played as a single quarter note instead of two 8th notes the very first time through. Future varations has that same beat played as an 8th with two 16ths (the same as beat two). Many other variations like this happen throughout.
He often crescendos (grow louder) on the last half of both the Am and C measures. The Em7/A chord is really just a couple of strokes where he doesn't have any fingers on the strings and he plays approximately the highest 3 to 5 strings (be sure to avoid the low E, though). The G(no5) that follows is just an anticipation, where he slips the pinky of the G chord on a 16th note early. Again he hits only about 3 strings on this stroke, but 4 is fine (try to avoid strings 5 and 6 though). In fact, if you're not trying to get your playing to be an exact copy of Dylan's then you could stay on Am the whole time. The chords he's playing are actually the kind of notes alot of players unintentionally create when swithching chords. They aren't critical to the song. So, if they trip you up, just stay on the Am for those 3 strokes.