Continuity mistake: Lois and Meg take the red car for their vacation at the spa, but while they are gone, Peter is seen driving it a few times. (00:08:00)
From Method to Madness - S3-E18
Continuity mistake: While Stewie and Olivia are performing, Olivia is wearing a light purple dress. After the performance, when Stewie and Olivia are sitting on the piano talking to their teacher, Olivia's dress and hair bow changes from purple to blue in between shots. She is also wearing dark red lipstick instead of none at all.
Brian Does Hollywood (2) - S3-E2
Continuity mistake: As Peter and Lois take Stewie to the hotel, as we first see Peter, he has on a blue suit. The next scene we see him, he has on a black suit. Then, as they get called in the room, he has his usual on: green pants and a white shirt. (00:06:05)
Continuity mistake: When Peter is calling for people to fight Lois, he is standing next to a sign that says "Fight the ass kicking housewife" and has metal rings at the top. When it moves to a closer shot, a hyphen has appeared between "ass" and "kicking". Then, after the space where the commercial break would have been, the sign now says "$10.00" and there are no metal rings. Finally, in the next shot, the sign says "Fight the..." and has metal rings on top. (00:06:55)
A Very Special Family Guy Freakin' Christmas - S3-E16
Continuity mistake: When Peter is driving, Quagmire is sitting beside him and Cleveland and Joe are in the back seat. Joe has brown hair and he's wearing a gray knit hat and a light coat with a gray fur collar. When Quagmire is sticking his body out of the car door and yelling "Whooooooa! Whoooooooa!", look at "Joe" in the back seat. Joe doesn't look like Joe in this shot. He's wearing a Santa hat and a brown coat just like Quagmire's, and a bit of his hair is also black like Quagmire's, instead of brown. (00:05:30)
Family Guy Viewer Mail #1 - S3-E21
Continuity mistake: When Lois picks up the fridge there is nothing stuck to the fridge but when she puts it down there is a note stuck to it. (00:09:40)
Mr. Griffin Goes to Washington - S3-E3
Continuity mistake: In the scene where Peter is at the baseball game, Stewie is sitting next to a boy he calls "Opie." The camera then cuts away to a clip. When the camera cuts back, "Opie" is gone and a grown man is now sitting next to Stewie. (00:02:55)
To Live and Die in Dixie - S3-E12
Continuity mistake: When Lois is on the phone to the FBI agent, the phone switches from being an old fashioned circular dial phone, to being a keypad phone. (00:16:45)
Continuity mistake: At the bottom of the stairs there is a picture of Peter and Lois, and the song "So Long, Farwell" starts. The kids start singing and you can see in the backround the picture is gone then comes back when the kids are going back up the stairs. Not only that, look closely at the picture of Stewie, you will see it has grown. (00:04:20)
Continuity mistake: When the family is in the traffic jam there's a shot from the front of the car, and in the next shot from the backseat of the car, Peter's face (glasses and part of nose) is reflected in the rear view mirror. However, there's no rear view mirror in the first front shot or shots following backseat shot.
Continuity mistake: When Peter is pretending to be a man-eating tree, there is more of a shadow on the tree in the first shot than in the shot right after he spits out 'Dan Rather'. (00:05:50)
One If By Clam, Two If By Sea - S3-E4
Continuity mistake: After Peter has been to the newly opened bar, he runs to his house door (which is red) and when he opens it, the colour has changed to brown.
Continuity mistake: Just before Peter enters the tunnel in his new car, the white line in the middle of the road is blotchy and not continuous. When the shot changes to Peter's POV, the line has completely disappeared. The next shot which shows the car side on, there is now a straight white line on the road. (00:14:20)
Peter Griffin: Husband, Father...Brother? - S3-E14
Continuity mistake: When Stewie jumps on the picnic table and begins his dance, at one point he undoes his coveralls and removes his shirt. In the next shot he is fully clothed.
Continuity mistake: When meg is at the car with the girl and the two boys, the guy on the right has the Q and a basketball above it. In the next shot the basketball becomes white. (00:12:17)
Continuity mistake: At the football game, the row of people behind the Griffins disappear in one shot, and reappear in the next, with not enough time for them to have all moved away, and all moved back. (00:07:10)
One If By Clam, Two If By Sea - S3-E4
Other mistake: After the hurricane passes, Peter acts like he's been impaled by a wooden plank. He pulls it out as if it was attached to his right side. However, the way the metal on the clasp was bent, the only way the wooden plank could've been positioned that way is if the metal was over his shoulder.
The Thin White Line (1) - S3-E1
Continuity mistake: When Brian is saying that his family has it all wrong about his drugs, Lois is holding Stewie. In the very next shot of his family from the front, Stewie is standing on the ground, without any time for him to climb down. (00:15:10)
Factual error: When Carol gives birth there is no umbilical cord. (00:06:30)
Peter Griffin: Husband, Father...Brother? - S3-E14
Continuity mistake: When Chris says "Cool, I get to be black and Irish, he is holding three books, the top one being green. A few moments later, the top book is brown.