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Revealing mistake: As the Wormwoods are driving out of the hospital parking lot at the beginning of the movie, the shot of the car driving from right to left has been flipped, as evident by the quick appearance of a hospital directory sign in the background being mirrored. (00:01:48)
Answer: The "real world" answer is that it's a movie, and without Trunchbull, there's no villain at the school for Matilda to battle. Within the context of the film, everyone, including the staff, is afraid of her and fear if they speak up, she'll retaliate.