this happens all the time in tv and movies. it is really cheesy to those who have an eye for this.
basically it is called "poor continuity".
most likely the scene without the toothpick was filmed 3 to 4 hours prior to the scene with the toothpick. then someone would say, "shouldn't we put a toothpick in it" but didn't think about the scene prior to this. or because they do the take so many times they keep bringing new sandwiches in to george and one of them happened to have a toothpick in it. that is why those people only get $100 to to $150 a day for 12 - 14 hour shifts.
good call