Factual error: When the witches follow Mary into the alley after singing I Put A Spell On You, Mary Sanderson said she smelled Scrod, a bottom feeder that would be good with margarine. 300 years prior to that, butter would be the topping of choice as margarine hadn't been invented until the 1800s, when the sisters were dead.
Suggested correction: She doesn't say margarine. She says marjoram, which is a herb.
The official subtitles on a retail copy of the movie says "margarine."
The mistake is correct. She does say margarine, not marjoram. She even follows this up with "Or oil. Olive oil works", so she's talking about cooking with some sort of fat, not an herb.
Bishop73