When Charlie Brown gets in the car after he first injures his hand while cranking the Car at the Rent a car place, Linus is in the back seat, but when they leave the Rent A Car Place and Run into the French Girl on the bike, Linus is in the Front seat
During the opening credits, the title of the book about King Arthur is misspelled "Arther."
There should have been a road sign informing Charlie Brown and the others they had crossed the border into Belgium.