Continuity mistake: 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.
Continuity mistake: When Leatherface picks up Pam and puts her on the hook you can assume that the hook has gone through her back right shoulder blade. However when the third guy enters the kitchen in the murder house and hears the cadaver knocking at the lid of the tomb freezer, when he opens it and it twitches out there is a clear shot of her back with no apparent injury.