Goofs

Leatherface sticks a girl on a meat-hook and it goes in her back. But in the next shot you can clearly see she is sitting on the hook, because the curved part is sticking out from between her legs.

At the end of the movie, Leatherface is hit in the head with a wrench and falls into a ditch, where his clothes become completely filthy. Yet, when we see him in the next shot, his clothes are clean.