Italian, Non aprite quella porta (Don't Open That Door).
Japanese, 悪魔のいけにえ (Akuma no Ikenie), Devil's Sacrifice.
Enforced Method Acting: In the original when Pam is hung up on a meathook, the actress was held there by nylon rope tied in between her legs. The position ending up being extremely painful for the actress, and the screaming Pam does in the scene is in genuine pain.
When Leatherface cuts Pam's finger so Grandpa can drink her blood, the device attached to the knife that was supposed to squirt stage blood broke. Gunnar Hansen, already breaking down from having to film the scene (see Sanity Slippage), proceeded to cut her finger open for real in order to get the scene done.
Sanity Slippage: Happened for real while filming the infamous dinner scene. The food rotted under the filming lights, and created a horrific smell, combined with the one scene filmed for 27 straight hours in 110 degree weather that it actually drove the actors a bit nuts; the DVD commentary has Gunnar Hansen eerily recounting how he genuinely wanted to kill Marilyn Burns for a few seconds after being ordered to by his "brother." Vietnam veteran Edwin Neal (Hitchhiker) even describes it as worse than anything he went through during the war.