Revealing mistake: Near the end of the film, Charlie Brown, Linus and Snoopy all cast shadows from the moon, and then suddenly seconds later all the shadows are fully gone. Also, no shadows were cast from any other object around them when the shadows were shown on the characters.

A Boy Named Charlie Brown (1969)
1 revealing mistake - chronological order
Directed by: Bill Melendez
Starring: Peter Robbins, Andy Pforsich, Glenn Gilger, Pamelyn Ferdin
Continuity mistake: When Charlie's friends are watching the spelling bee on television, Violet says, "Atta boy, Charlie Brown, you can do it!", but in the very next shot Violet has disappeared.
Linus Van Pelt: You look like you've been through shock treatment or something.
Charlie Brown: What's more shocking than having your faults projected on a screen?
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