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.
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The Nightmare Before Christmas (1993)
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Directed by: Henry Selick
Starring: Catherine O'Hara, Chris Sarandon, William Hickey, Danny Elfman
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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".
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Answer: As seen in the movie, the Fog Juice made it difficult to see anything. Sally had hoped that with no way of seeing where he was going, she would be able to stop him from leaving Halloween Town and save his life.