For his scenes , Karloff is clearly standing in a bottomless coffin , rather than sitting up in it , a necessity given his chronic back problems and leg brace .
Karloff 's scenes were all filmed in a one - room mausoleum set on a separate soundstage .
For Karloff 's scenes , Karloff is clearly standing in a bottomless coffin , rather than sitting up in it , a necessity given his chronic back problems and leg brace .
Karloff 's scenes were all filmed in a one - room mausoleum set on a separate soundstage .