According to producer Joe d'Amato, the film was a commercial success mainly because of Achille Manzotti's idea to change the title from "Ghosthouse" to "La Casa 3". "La Casa 1" and "La Casa 2" being the Italian titles for Sam Raimi's Posesión infernal (1981) and Terroríficamente muertos (1987).
The shortwave radio Jim Dalen is using is a Yaesu FT- 726 R transceiver.
Made fun of by the MST3K original crew on RiffTrax.