Consider this link compiled by one of the experts at the IMDB board. Over there, a number of questions about the same movies come up over and over, and one chap has compiled them into a neat little FAQ.
And one of the answers is a link to one of Cecil’s columns!
“Hotel guest vanishes into thin air but hotel staff refuse to admit it” was also done as an episode of *The Big Valley *with Barbara Stanwyck and Linda Evans.
Cool link. I forwarded it to all my fellow editors here at the puzzle factory.