During the dinner scene towards the end of the film, when Leatherface cuts Sally's (Marilyn Burns) finger, he actually does cut her finger. The protective cover was taken off without warning Burns, and her reaction on screen is real. See more...
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Continuity: When the dad comes home, Leatherface is wearing a man's face. Then, only a few seconds later when he walks out of the kitchen he is wearing a woman's face, with makeup on it. This occurred due to a scene cut out of the movie. It shows Leatherface taking off the man's face and putting on a woman's face and applying makeup to it.