During filming, Kane Hodder's dressing room was a quarter of a mile down a dirt road. One night filming ended at 2 a.m. and while still in the Jason costume he decided to walk through the woods on a path to his dressing room. As he was walking someone approached him and asked if he was with the movie. He didn't reply, because he thought it was a pretty stupid question to ask, as he was standing there in full Jason costume. When the man asked again, Kane took a little lunge at him and grunted. The guy took off, tripping and running. The next day director John Carl Buechler told Kane that the local sheriff was supposed to stop by, but he never showed.
Kerry Noonan, who played Paula in Friday the 13th Part VI: Jason Lives (1986), read for the role of Tina when she thought the title was "Birthday Bash." She quickly realized that it was a Friday the 13th film and confessed that she'd starred in the last movie, so John Carl Buechler decided not to cast her.
Director John Carl Buechler has publicly fumed many times over the years about the number of edits required by the MPAA to avoid an "X" rating. The film had to be submitted nine times to the Motion Picture Association of America before being granted an "R" rating, and it stands as arguably the most heavily censored entry in the 'Friday the 13th' series.
Jason's mask in this film was cast from the same mold as the original mask from Friday the 13th: Part 3 (1982), but was modified slightly. In addition to the damage seen on the mask (the axe cut and propeller damage), the edges of the mask have been trimmed to make it smaller, to allow more of actor Kane Hodder's head to be seen.
This film was originally intended to bring horror icons Jason Voorhees and Freddy Krueger together onscreen for the first time. However, when Paramount Pictures (which at the time held the rights to the "Friday the 13th" series) and New Line Cinema (which holds the rights to the "Nightmare On Elm Street" series) couldn't agree behind the scenes, the script was rewritten to pit Jason up against the telekinetic Tina Shepard instead. The cross-over wouldn't happen for another 15 years, until Freddy vs. Jason (2003) was finally produced.
Walt Gorney: the veteran actor who played Crazy Ralph in the original Friday the 13th (1980) and in Friday the 13th Part 2 (1981) returns as the voice of the narrator during the opening of this film.
John Carl Buechler: (at around 1h 24 mins) the firefighter who picks up Jason's broken mask at the end.