The amount of wine in Wallace Shawn's glass varies in a manner not consistent with his drinking from it (or having it refilled).
Shortly after the main course is served, Wallace Shawn's plate disappears, then a few minutes later, it's back again.
The edges of the collars of Andre Gregory's shirt are folded sometimes under and sometimes over the collars of his own jacket.
In some scenes with the back of Wallace Shawn's head to the camera, the shadow of the boom mic can be seen on his bald head.