Get to the part where Tom Hanks is on the island burying the dead guy from the airplane crash. When the dead guy is lying right next to the hole for his burial spot keep an eye to the bottom right corner of the dead guy's shirt. First, you see that it's tucked in. On the next shot it's not tucked in. After that shot, it's tucked back in. Now why would Tom Hanks tuck and UN-tuck his shirt?