Other mistake: When Jack first arrives in Christmas Land he doesn't know what is falling from the sky (snow) but he somehow knows that the children are throwing snowballs.

The Nightmare Before Christmas (1993)
Ending / spoiler
Directed by: Henry Selick
Starring: Catherine O'Hara, Chris Sarandon, William Hickey, Danny Elfman
Jack is shot down by the military while delivering his Halloween Brand of Christmas. He lands in a graveyard in the arms of an angel statue. Once his faithful ghost dog Zero puts him back together, he realizes how horrible a mistake he was making, and comes to terms with himself, actually becoming excited about next Halloween. He then remembers what he needs to do, and goes to free Santa Claus. Meanwhile, Oogie-Boogie has captured both Santa and Sally, intending on playing his deadly, cheating games with them and most likely eating them. He cheats and is about to send them into the lava pool when Jack saves them. Oogie-Boogie tried to kill Jack with the various traps in his lair, but is eventually caught up in his own trap, literally coming apart at the seams.Oogie-Boogie defeated, Santa leaves, STRONGLY suggesting to Jack that the next time he gets the idea to steal someones holiday, to consult Sally first. He also sites her as being the only person that makes SENSE in Halloween Town. Jack and Sally return to Halloween Town, and Santa sets speed records undoing all the damage Jack did. He even gives Halloween Town a Christmas present: Their first snowfall.And at the end, Jack and Sally confess their true feelings of love for each other, embracing in a kiss as Zero happily flies off into the night sky.
Carbonite4
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