The mansion where much of the plot of "Cementerio del terror" (Cemetery of Terror) takes place is located near a cemetery, just as is the mansion in the movie "Quella villa accanto al cimitero" (The House by the Cemetery).
Kitty's death is a possible allusion to the impalement scene from "Cannibal Holocaust". Also, both films contain a huge display of sadism, blood, gore and gruesome deaths.