Revealing mistake: After the crazy man cuts his own hand, he laughs and waves the knife. Watch carefully and you can see the hose behind the blade the blood came through. (00:13:40)
Revealing mistake: The position of the hitch-hiker, in relation to the lorry, as it hits him, changes between shots. Also, the hitch-hiker is an obvious dummy as he is hit; you can see the fake limb attachment on his arm. (01:16:25)
Revealing mistake: When Leatherface is cutting up Kirk while Pam is on a meathook behind him, he cuts Kirk with the chainsaw twice, but when he lifts it up there is no blood on it. (00:38:20)
Revealing mistake: Toward the end of the movie, when Sally escapes from the Leatherface family in the dining room, she runs and jumps through a window. As she does, it is blatantly a stunt double; note the curly blonde wig. (01:15:20)
Answer: The name "Leatherface" is used in the scene set in the hotel, and the waterfall scene. The grandmother says "leatherface" right after she says "Maryana, crank up the chain saw" in the waterfall scene. She actually says it in a whispering tone, so you have to turn the volume up to the max.
I think you're referring to either a remake or sequel. In this film (the original made in 1974), there is no living grandmother that speaks, scene set at a hotel, character named Maryana, or a waterfall scene.
dewinela