Near the end of the episode, when Clark and Chloe hug, Chloe is not holding anything in her hand but in the next scene of the same hug, she is seen holding papers in her hand.
In the scene between Martha and Clark near the end of the episode, the cut on Martha's forehead switches from above her right eyebrow to her left, and then back again.
Towards the end, when Martha and Clarke are in the barn talking, not only does the injury on Martha Kent's forehead switch sides, so does the button holes on her jacket, indicating the scene has been flipped.
The last scene is captioned "Iguazú Falls, Patagonia, Argentina." Patagonia is the southernmost region of Argentina; the Iguazú forms part of Argentina's northern border. (The scene was really shot at Gullfoss in Iceland.)