Around 29:45, the letter shown that is being read is supposed to be handwritten but when you pause, you can tell it's a font that mimics handwriting.
Just past 24 minutes, in a time lapse shot of the sun going down behind a mountain, the vapour trail of a plane can be seen, high up on the right, heading towards the centre of the screen.
As main female character washes in the river a blue tent can be seen over her shoulder.
As the horses emerge from woods, a crew member in ski goggles and modern clothing can be seen.