This episode is called "Road to Europe" on the US DVD.
The DVD contains a deleted scene in Paris. The scene featured Brian and Stewie visiting Jim Morison's grave.
Peter and Dave compete with one another at KISS trivia and mention the band's appearance on "The Paul Lynde Halloween Special" from 1975. The show actually aired in 1976.
When Stewie (who is stoned) 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.
The camel salesman says that one of his camels was "only driven to mosque on Sundays" by its previous owner. It is more likely that the owner would have traveled to the mosque on a Friday.
Brian: 'Thats a nice do, for me to poop on'
"For me to poop on" is the catch phrase of Triumph the Insult Comic Dog.
Triumph is a dog hand puppet that is a semi-regular on Late Night w/ Conan O'Brian
Brian: Your favorite Hero is the Marquis De Sade.
Marquis De Sade was a "famous" sexual pervert.