Continuity mistake: When Francine gives the family gifts, Stan writes "How did you pay for this?" on his board. Francine replies "Well, money, of course" to which Stan writes another sentence on his board. He starts writing without clearing the board, yet when he turns the board back to show the sentence "Is that true, Steve?", the original "How did you pay for this?" isn't visible on the board, despite not clearing it.