During the dinner scene towards the end of the film, when Leatherface cuts the girl's finger, he actually does cut her finger because they couldn't get the fake blood to come out of the tube behind the blade
DVD Easter Eggs: (Hidden So You Don't See Anything You Don't Want To See)
Edition: Pioneer Video
Description: Alternate takes of decomposed body
Go to a deleted scene where they have some flashing shots of decomposed skeletons cut from the flashing light dead body scene at beginning of the movie. Play the deleted scene until the end.(Do not press stop or go back to maim menu). After deleted scene is finished it has part 2 of the deleted takes also showing all the explainations highlight play and enter to see the alternate takes of the decomposed graveyard body.