Continuity mistake: At the end of the film Leatherface takes a socket wrench to the face and falls down into a roadside ditch getting his clothes rather dirty in the process. Moments later, when he's doing his macabre chainsaw dance, his clothes are all nice and clean again.
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.