Other mistake: In the Todd-OA version, just before the song "Oklahoma." Gordon MacCrae puts his hand on the porch post and the post moves off the rail. He then pulls it back.
Other mistake: The catapult on the battlements Jean uses to evict the castle guards is rather curious. First, there is neither a bow nor any torsion to 'power' the weapon, and secondly it just seems to cock itself, right after each shot. All that Jean does is pull the lever and none of her diminutive helpers stand by for any cocking work whenever the catapult arm is shown.
Other mistake: In one scene a station wagon pulls up with a 300 to 400 pound dead deer draped over the hood. Later, as the shot changes, one of the hunters can be seen in the background easily carrying the obviously fake deer.
Other mistake: Philip De Guard is the cartoon's layout artist, yet when we see his name in the opening credits, it is spelled "Phillip" instead of the usual "Philip."
Other mistake: When scientists Cal and Ruth exit the spacecraft in their high-winged light airplane, the aircraft's ID markings are reversed while in flight. All other scenes with this light plane's ID markings have the image correctly displayed.