Continuity mistake: As the train leaves Victoria, the scenery outside the window moves from left to right. Moments later, Charlie Brown is watching it pass from right to left.
Continuity mistake: Peppermint Patty can be seen in the same class as Charlie Brown and Linus, even though she says that her school has chosen her as a Foreign Exchange Student and is apparently unaware that Charlie Brown has been given the same honor.
Suggested correction: Peppermint Patty lives on the other side of town from Charlie Brown and Linus in America, so she does not attend the same school.