Director Bob Clark was planning to release a remake of this film in 2007. Unfortunately, though, he died in a car accident before production plans could get started.
The names on the tombstones in the film are the names of various crew members of it.
The film's script was written in 10 days.
The film's Italian title is "L' Assedio dei Morti Viventi", which translates to "The Siege of the Living Dead".