Go to the part about 10 minutes into the movie where Forrest is on the school bus for the first time and no one wants to give him a seat. Then, Jenny says he can sit down if he wants. When the camera is on Jenny, look behind her to the seat behind them. There is no one there!!! AN EMPTY SEAT!!! Anyways, the camera will show Forrest and then go back to Jenny and the seat is still empty. Then, it will show Forrest again. Then, when it goes BACK to Jenny, you can see that there are now kids in the seat behind them!!! WHOOPS!!!!!