During the end scene in the barn. The Cart comes down the rail track, nearly hitting Todd, and smashes into another cart at the bottom of the track. A few seconds later you can clearly see the cart is back at the top of the track again.
Toward the end of the movie, Barbara and Tiger are standing on the shore. Michelle calls out to Marnie and Barbara answers. This part of the scene was re-shot after many of the actors had gone back to NYC.
The scene where Glazer picks up firewood as he heads back to build a fire for Sally, he's obviously wearing a wig. This was because this scene was filmed later and they were trying to match his hair to earlier scenes.