Continuity mistake: After Art yells for Jesse to come to eat lunch, the stick of butter on the plate is roughly parallel to the edge of the table, but is diagonal when Art and Jess come to the table. A later view from the other end of the table shows the stick of butter parallel to the edge again. Some of the family members take a roll out of the basket, but none take any butter (so did not move it). (00:20:45)