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)
Mr. Griffin Goes to Washington - S3-E3
Continuity mistake: When Mr. Weed is crying about losing his job, we see a view of a long line of trees in the window behind him. The camera switches to a close-up of Peter. When it zooms out again, the trees on the right of Mr. Weed are missing.
Suggested correction: I watched this part of the episode twice and no trees are missing in the window behind Mr. Weed after the close-up on Peter. Actually, Mr. Weed's head is covering part of the window where you can't see the trees on the right when he's lying on the table, but when he gets up you can see all the trees.
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)
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.
Continuity mistake: When the flag team first walks out to the field, they are all in a straight line. Next time they are in two seperate lines with Meg at the head. Also, the girl with the head brace moves to the front when she is seen in the back. There is not enough time for them to move into the lines. (00:06:50)
Continuity mistake: When Lois is talking to her father about Peter wanting to be friends with him, the two emblems on Carter's shirt disappear between shots. (00:07:55)
Family Guy Viewer Mail #1 - S3-E21
Continuity mistake: Just before the genie comes out of the bottle, Peter's hands move from holding the bottle and the opener away from each other, to opening the bottle with the opener, between shots.
Death Lives - S3-E6
Continuity mistake: In the scene where Peter gets a ride from Cleveland, there is no one behind the wheel of the car while Peter is walking up to the front door.
The Kiss Seen Around the World - S3-E8
Continuity mistake: Brian is looking at board games. Before he spots his favourite (in the wide shot), there is a game of Snakes & Ladders to the left of Chinese Checkers. In the close-up, S&L is gone, and CC has moved up closer to Brian. (00:00:50)
Continuity mistake: As Stewie is about to eat his brisket (just before he throws it at Meg) he is cutting part of it off. Just as he cuts through the shot cuts and you can see the brisket is now back in one whole piece. You can also see the mashed potatoes change from white to green.
Continuity mistake: In the scene where the family are singing an African song, they all point their arms up to the ceiling yet in the next shot, Lois's arms are immediately cupped and pointed downwards - you don't see her moving her arms to that position.
Continuity mistake: When they are at the football game and Meg and the flag girls come out, and after Lois says, "Oh Peter, isn't she beautiful?", Peter's hot dog is yellow and has ketchup. But after he throws it on the field, it is back to normal. (00:07:30)
Death Lives - S3-E6
Continuity mistake: The white volleyballs turn into colorful beach balls and then back into white volleyballs. (00:13:05)
Continuity mistake: When Chris tells Meg not to rake the two leaves because they are his friends, one leaf is brown and the other is yellow. After Meg picks them up and crushes them, they're both brown.
Continuity mistake: Stewie and Brian are having breakfast at the hotel. When they spot the hot air balloon, the plates on the table disappear between shots. (00:11:50)
One If By Clam, Two If By Sea - S3-E4
Continuity mistake: When Peter comes home from the British-ruled bar, he runs into the British owner and Lois. Lois takes Peter into the other room through the same door Peter came in from the outside.
A Very Special Family Guy Freakin' Christmas - S3-E16
Continuity mistake: When Santa tells Stewie to smile for the camera, there is a white pompom below his beard, but in the next shot, it is gone. (00:12:25)
Continuity mistake: When the black knight pushes Peter's face into the table, there are cream-coloured serviettes (napkins) laid out, but in the next shot, there are blue serviettes. (00:16:45)
Continuity mistake: When Stewie is watching Jolly Farm Revue for the second time, he is sitting roughly in the centre of the mat, but in the next shot, he is sitting near the edge of it. (00:03:15)
The Thin White Line (1) - S3-E1
Continuity mistake: When Brian is giving his speech at the end, it shows two policemen. The one on the left has a brown drink and the one on the right has a yellow drink. But in the next shot, the one on the right has a yellow drink and the one on the left has a clear drink. (00:21:05)