Revealing mistake: When the red Dalek falls down the shaft, there is a very clear shot of its base with three small furniture casters (though it must be a dummy, as there is no hole for the operator's feet to protrude).
Revealing mistake: When Sir James breaks into the house of Squire Hamilton, we are shown a long shot of the tin mine underground with the zombies being whipped by the Squire's men. Watch the back of the shot - several blows from one man hit a couple of the wooden props supposedly supporting the roof, which obviously wobble about and show they are just for decoration rather than any practical purpose.
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.
Revealing mistake: A safety wire is visible as Grandpa hits the low tree branch that knocks him off his horse.