Revealing mistake: The stick used to make Jack's dog levitate is sometimes visible, for example when Jack is alone on the mountain.
Revealing mistake: During the song "This is Halloween" at the beginning, when the bats fly in front of the moon, the strings that they are attached to are visible.
Answer: Except they're a reanimated corpse and a skeleton. They are either already dead (or undead), or, given how things seem to work, the normal natural laws don't apply to Halloweentown.
Greg Dwyer
But how did Santa survive the Iron Maiden? Especially with how big he is, he certainly would have been killed.
You're trying to apply the rules of the real world to fictional magical beings.
LorgSkyegon