Philippe, have you ever seen Roger Corman's early (and bargain-basement-budget) feature, "The Undead" (I think released in 1957?). It weaves together a number of plot elements that were recycled in the Vicki Winters time travel storyline on DS.I think these themes were very much in the air in the 1960s.
There was a wonderful Black Sabbat sequence in the DS newspaper comics, of course, and I'm pleased to report that Mrs Barnabas Collins (nee Bouchard) WAS among the honored guests.