Funnily enough I was just congratulating them on having the cast sing 'Up an War them a Wullie', which IS completely authentic to the period, when along came 'Amazing Grace'!
I also agree that it was otherwise a pretty good stab at RLS. I thought it captured the dark mood of the book particularly well - and the tapsel teerie chase across the Highlands.
Does anyone know where it was filmed? Were the Highlands actually the Highlands? I'm sure they didn't use South Queensferry - where was that?