Continuity mistake: When Charlie Brown sleds home from the library, the book flies into him and throws him into the chair. The table that the book lands on has a pencil on it, but in the next shot, it is facing the opposite way. (00:48:58)
Continuity mistake: At the library, when Charlie Brown and Marcie talk to each other on opposite sides of a bookshelf, a red book repeatedly vanishes and reappears between shots. (00:47:08)
Continuity mistake: When Franklin tells Snoopy that there are no dogs allowed in the school and closes the door on him, there are two paper snowflakes on the right door window, but in the next shot, they have vanished. (00:08:50)
Other mistake: Charlie Brown asks Linus if everyone likes him for who he is, or who they think he is. A crowd of kids then starts to form around Charlie Brown, and a camera crew starts filming him, but the reflection in the camera lens is not backwards, and the kids behind him are also not present in the reflection. (00:44:35)
Continuity mistake: This is near the end of the movie when Charlie Brown is running to catch the Little Red Haired Girl before she boards the summer camp bus. As Charlie encounters obstacle after obstacle he runs into the "Kite Eating Tree" and asks for help. A kite falls down and he gets tangled up in the string and he is pulled away. There is no ball of string at the end. Several cuts later when everyone is amazed that Charlie Brown is actually flying a kite and following him, a ball of string magically appears and Charlie Brown is holding it while running and flying the kite.
