The end titles of the U.S. version, "7 Doors of Death" are full of incorrect billings.
David Warbeck's character John McCabe is billed as "Doc." Antonie Saint-John (here called Tony Saint-John) is billed as Joe the Plumber. He actually played Schweick. Veronica Lazar is billed as playing the little girl, Jill. She was Martha, the housekeeper. Jill was played by Maria Pia Marsala. Someone named "Philip Ostrow" is billed as playing Arthur, Martha's son. He was played by Giampaolo Saccarola. Martha is billed as being played by someone named Margaret Lund. She was played by Veronica Lazar. Mary-Ann (billed here as "Joe's Wife") is billed as being played by someone named Helen Pierce. She was played by Laura De Marchi. Schweick (billed here as "Sweik") is billed as being played by someone named Robert Leahy. He was played by Antoine Saint-John. Dr. Harris is billed as being played by someone named Jim Barrett. He was played by Al Cliver.
If you count Catriona MacColl and Cinzia Monreale's real names not being used, every single cast listing in the "7 Doors of Death" version is wrong in some way or another.
Just after the credits, when the screen turns black, a scream is heard.