The orientation of how Hachi holds his spear while talking to the young woman and the old woman changes from cut to cut. At times he has his arm extended and other times his elbow is bent.
When the old woman is hammering the wood post near the pit a couple of the banging sounds are not synchronized with the visual action.
When the two soldiers get off their horses and start fighting in the river the audio of the water splashing goes on and off. In addition when the swords clash there is no sound of clanging heard.