When Joosep reloads the gun he shoots himself with, it's obvious that the magazine he enters is empty.
Kaspar cuts off the mark on his jacket on the fourth day, but in the beach scene on the sixth day the mark is still on the jacket.
When Kaspar is released from the shed and his mobile phone rings, a polyphonic ringtone plays, but the phone he is using is obviously Nokia 5110 or something of this kind (the antenna is visible) which does not support polyphonic ringtones.