Revealing mistake: During the dinner, Dennis is addressing his sister. As she comes over by him, look at his left sleeve. It appears to be matted in, as it has a definite line at the edge of the fabric, where all other edges are softer. Then as Eldona sits the plate down, you can see a flutter between the images of Dennis' arm and the plate. Then, as Eldona turns around, you can see her dress through the gap between Dennis' arm and the plate.