When Ben introduces Larry to Cady the level of drink in the bottle he is holding goes from nearly full to nearly empty and back again between shots.
When Larry steals some cake from Michael's plate, he pierces it with the tines on his fork. However, in the next shot that piece of cake is resting on the fork instead.
Ben Stiller says that Larry David gave him a "scratched retina" when he poked him with a kebab skewer. In order to give Ben a scratched retina, Larry would have had to pierce the eyeball all the way to the back of the eye. He's actually referring to a "scratched cornea".