10 minutes in, when Davey and McNab hear Annie calling, the sky above them is gray and overcast, but a few seconds later as they run down the hill, it has cleared and is bright blue.
When Davey says, "How lucky I was to land in Stirling Gaol", John Hurt says "Sterling" (as if talking about the currency and not the city).
However, in various Scottish dialects accents, the name 'Stirling' can often sound like 'sterling' or 'sturling'.
When Davey, standing by the cairn, talks about his father, the line "And how would my harlot mother know which one sired me?" has apparently been recorded apart from the rest of his speech.