(at around 1h 18 mins) When Po returns to his father's restaurant after the fight at the end, there is a mom pig and son pig that are waiting to meet Po. When Po finally comes, his father and him talk. While the two are talking, the pig family disappears and reappears between shots.
(at around 14 mins) During the flashback of Po as a baby, he goes into a pot headfirst to retrieve a vegetable. In the next scene, it shows he landed on his bottom, not on his head like he went in. If you look closely, however, you can see him move around after getting the vegetable, and that is how he ends up on his bottom.