In a flashback scene when little Noi is making funny faces to little Sai, it's shown that his hands are on his face but in the next shot it's not, this continues until the scene ends.
When Sai is cleaning up the wound, it is shown that her hair is covering her ears. In the next shot her ear is shown.
When Sai transforms to a krasue at the movie theatre, when her headless body is shown, there is a head, in the next shot.