Continuity mistake: At one point in court while everyone is laughing, Patty's hair is colored wrong. Her hair is a similar shade of color as Rod and Todd (who are sitting next to her) rather than her own bluish grey hair.
Continuity mistake: Milhouse shows Lisa a laptop with e-mails on it. There is also a shot with a list of the e-mails. At no point does anyone click anything, but the next shot shows a different page on the laptop.