This slip-up occurs when Sara is sitting down to have Thankgiving dinner and is not sure if Nelson is coming back or not. Nelson suddenly comes in through the window and starts to say Merry Christmas. When he starts to hand out the presents you can see the bag change places. After he gives out the first present, which was a salomi, the bag was open and you could see the other presents, but when he goes back to get the next present the bag is suddenly closed to where you can no longer see the presents in the bag. It is just something small, but something I happened to notice :)