Corabeth is placing items for an order on to the counter at 20:47, in the very next shot after the camera angle changes back and forth the first item she placed down is no longer present and is back on the shelf it came from. Different items are now on the counter.
This is the third incarnation of Grandpa Walton's grave site, and the stone looks nothing like it once did.
At 22:44 you can see someone walking in the background in the trees while Jason and Ted Lapinsky are fishing.