Character mistake: At the beginning Sally follows Jack at the end of the Halloween celebration where he sings "Jack's Lament." She then goes off to gather more deadly nightshade. Look at Sally when she sits down. It is in front of a stone labeled "witch hazel" and "deadly nightshade" is seen next to it on the right. Yet, Sally pulls two pieces of witch hazel out of the ground, before a quick cut back to the lab where we see her putting it in a jar marked "nightshade".

The Nightmare Before Christmas (1993)
1 character mistake
Directed by: Henry Selick
Starring: Catherine O'Hara, Chris Sarandon, William Hickey, Danny Elfman

Continuity mistake: After Jack is blown out of the sky and is lying in the graveyard, he has several grey smudges on his face from the explosion. But in the very next shot, a bird's eye view of Jack lying across the angel, the smudges have disappeared. (00:59:10)
Dr. Finkelstein: That's twice this month you've slipped deadly nightshade into my tea and run off.
Sally: Three times.
Trivia: At one point during the song "Jack's Lament", Jack pops up between two tombstones. The tombstone on the left is a figure from the painting "The Scream", and the tombstone on the right is the horse from Picasso's "Guernica".
Question: How did Jack save Sally and Santa Claus in Oogie Boogie's lair by transporting them from the lava pit to the Iron Maiden? Wouldn't they be killed by the Iron Maiden?
Answer: He was hiding behind Sally.
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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