Revealing mistake: Sam is supposedly far away from civilization, but throughout the movie you can see a ski slope in the background. (00:16:05)
Revealing mistake: When Atlas climbs on the freight elevator and punches the baddie's hat, his punch is lame and fake, to say the least. (01:22:46)
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.