Continuity mistake: When Stewie has chicken pox the red marks on his face change position many times between shots. A noticeable one is just as he is saying "No, damn you, I've got to finish what I started".
Continuity mistake: When Stewie and Bertram are parachuting down to Earth after the air strike, their parachutes get much closer to each other between shots. This occurs just before they start slapping each other.
Continuity mistake: Brian and Stewie see Meg enter Mayor West's motel room. She's wearing a purple dress. They follow them to a restaurant and Meg has her regular hat and outfit on.
Peterotica - S4-E24
Continuity mistake: After the Quahog Creek clip is over, they show a picture of the house. In the background there is a tall silver building that wasn't there the last time they showed a shot of the house. (00:17:45)
Peterotica - S4-E24
Continuity mistake: When Peter is reading Lois his erotica in bed, the size of his paper changes just after he says "his really cool spaceship".
You May Now Kiss The...Uh...Guy Who Receives - S4-E25
Continuity mistake: When Peter drives his car in the field it is perfectly visible, but in the next couple of shots the car's gone, and so are the tire tracks.
Petergeist - S4-E26
Continuity mistake: The table with the TV on in Peter and Lois' room is just a small table at the beginning of the episode when Stewie talks to the poltergeist. But as they speak to Stewie in the TV it's on a high up chest of drawers. (00:08:00 - 00:12:00)
Petergeist - S4-E26
Continuity mistake: Lois slaps the skull out of Peter's hand and it lands on top of the dirt pile. They both turn around to look at the house and the skull is nowhere in sight.
Petergeist - S4-E26
Continuity mistake: The filing cabinet that was beside the TV moves to the corner beside the desk.
Petergeist - S4-E26
Continuity mistake: When the spirits first come out of the TV, notice the wall beside the TV. There's nothing there. Brian says who's here? Next shot shows a filing cabinet with a pink blanket on top.
Untitled Griffin Family History - S4-E27
Continuity mistake: In the scene where Al Cowlings and his "trusty white bronco" help the Griffins escape, his white horse changes color to light brown during the passing view then changes back to white in the following overhead view.
Continuity mistake: When Stewie is trying to get a drink from Brian, there are two alcohol bottles on top of the table. But one is gone for two shots, then comes back. Also the bottles change from closer to father.
Continuity mistake: Brian insults Stewie about the water and there is a water glass by Bryan's plate. Then it cuts to a shot of Stewie and Chris, and the glass is gone.
Stu & Stewie's Excellent Adventure - S4-E30
Continuity mistake: At the end of the previous episode, Stewie gets on a cable car and sits next to older Stewie and they are facing out of the car. However, at the start of this episode, the seat they are sitting on is facing forwards.
