Fortune Cookie / Dear John - S3-E8
Continuity mistake: When Filburt first reads his fortune cookie, it says "Bad luck and misfortune will infest your pathetic soul for all eternity". But later on when he is walking down the street it says "Bad luck and extreme misfortune will infest your pathetic soul for all eternity". (00:03:25 - 00:04:25)
Fish-N-Chumps / Camera Shy - S3-E4
Continuity mistake: Near the end of "Camera Shy," when Heffer gets the check out of the envelope, it's light blue. But when the shot changes it suddenly becomes black like the "censor bars" sticking on him and Filburt, so they obviously accidentaly used the wrong color.