The film was originally released with the on-screen title of 'Savage Vengance'. The title was accidentally misspelled, when first released by Magnum Video in 1993. A new title screen was made for the Massacre Video release in 2013, correcting the error.
One murder scene was clearly filmed after Camille Keaton had walked out on the film. The scene where a man is killed by a chainsaw features no head or face shots of 'Jennifer'... only shots of the bottom half of the character from behind are scene, indicating it wasn't Keaton.
When Tommy is talking to two of his murder victims, as he touches one "corpse" head the actress blinks.
Throughout the film, the Camille Keaton character is credited under 3 slightly different aliases-- In the beginning of the film, the end credits and following the end credits-- a sequence where the main actors/actresses are shown with still images and actor/actress name.