The ossuary (a crypt for bones) that was used in the film was quite real. Supposedly one of the crew members removed some of the bones from the ossuary during filming, but quickly replaced them the next day claiming to have encountered an angry ghost following the removal of the bones.
When Francesco and "She" are kissing in the crypt with the shroud over their heads, the shot mimics the painting, "The Lovers" by René Magritte.
The sets for the cemetery in the film were built upon actual abandoned cemetery grounds in Italy.
In the late 1990s, when Rupert Everett gained some popularity in America, he approached Michele Soavi about doing an Americanized remake of 'Dellamorte Dellamore'. It never materialized though.
According to Director Michele Soavi, The "returners" get their energy from the Mandragola roots in the cemetery.