Revealing mistake: Wires are visible on the Dalek saucer in almost all shots of it flying.
Revealing mistake: Al Lewis and Yvonne DeCarlo's stunt doubles are obvious when Grandpa and Lily mount the horses.
Revealing mistake: The zombie of John Martinus throws the lifeless body of Alice from the tin mine pit head onto the ground. When Sylvia examines the body after, Alice very obviously blinks. Visible at normal speed, but easier to see slowed down.
Revealing mistake: When the US Navy engages the enemy at the blockade on the Yangtze River, during combat scenes, a sailor's (prop) bayonet wiggles on board the San Pablo.
Revealing mistake: At the Halloween Party, a girl with a green dress says to Charlie Brown, "Charlie Brown, you'll have to model for us." When she says this, she suddenly grows a third hand, then she has two hands again a little later.
Revealing mistake: When George and the young man are in the garden, telling jokes and drinking bourbon, the young man pours some bourbon into George's glass, but the bourbon, instead of being brown, is clear, like water.