In the scene when Stewie says farewell to Brian at the doors of Jolly Farm Revue, as he says "Well, this is it," two plain brown doors are visible. After a cut to Brian, Stewie starts to walk inside and suddenly there are two handles on the doors, right above Stewie's head.
When Stewie sets his fork on the table in the coffee shop, it disappears afterwards.
A scene at the KISS concert shows Peter Criss having blond hair and wearing a shirt with no sleeves. But in a scene afterwards, his hair changes to it's normal color, black, and he is wearing a shirt with sleeves.
At the scene where Brian and Stewie are on a tour bus in Germany, you can see that in one shot, the color of the tour guide's microphone is black. However, in another shot, the microphone is red.
After Peter warns Chris and Meg about the Candy Tree, in the next scene the girl the tree eats appears suddenly instead of walking from off screen.
When Stewie first spots a line of children whom he thinks they are going to London, the girl in the red jacket is carrying a bag and the boy in the brown suit is carrying nothing. However in the next shot, the girl is carrying a doll and the boy is carrying a suitcase.
When Stewie starts to follow the children thinking they are going to London, the buttons on his overalls change from grey to yellow.