Compared are the cut UK VHS by Thorn Emi (BBFC 18) and the uncut R-Rated-DVD by Shout Factory.
Difference: 14 scenes with a total length of 53.5 seconds.
While the first one of the three-part slasher series was uncut in British movie theaters, the VHS by Thorn Emi contains several cuts with a length of almost one minutes. Furthermore, the original title was retitled to "Slumber Party Murders" because the right holder feared the movie was going to end up on the infamous list of "Video Nasties". Subsequent DVD releases with the original title were uncut.
Due to deliberate censorship, the original title "Slumber Party Massacre" became "Slumber Party Murders" for the VHS release.
Russ chokes the woman in the bacl of the van and gets a drilling machine. He kills her with it offscreen, blood splatters around.
Russ injures Linda's arm with the drilling machine. Linda tries to run.
Diana slides down the wall in front of Russ who's right in front of her with his drilling machine.
Russ raises the drilling machine. Diane looks up to him fearfully.
The drilling machine goes right through John's chest.
Jackie turns around to the others. Her throat is slashed. Then she goes down. Russ comes rushing in.
The camera tracks down from Kimberly's face twisted with pain to her belly with the knife Russ rammed into her.
Extended shot of Russ with Kimberly dying in his arms.
The killer reaches back with the drilling machine in his hand and slashes Jana's belly.
Trish rams the machete into Russ' wrist.
Russ screams in agonizing pain. His chopped off hand falls to the ground.
He screams while he's looking at his bloody arm stump.
Trish slashes his belly sideways with the machete. He grabs his wound and spits blood.
After Russ fell on the machete, he spits some blood. Trish pushes him aside.