According to co-producer Dennis Stuart Murphy, the idea to have Jason wear a burlap sack over his head in Part 2 came from their costume designer, who figured it was the type of readily available item Jason could have conceivably and easily procured.
Following the release of Friday the 13th (1980), Adrienne King had numerous encounters with an obsessive fan which escalated into a stalker case, and she chose to retire from acting after this film. She later returned to the profession in 2010 with the film Psychic Experiment (2010).
In the scene when Jason crashes into the window and grabs Ginny, the actor, Warrington Gillette was actually hurt. He tried to break into the window, only it didn't break, and he ended up banging his head really hard on the glass.
Warrington Gillette's agent told him he had a part for a Camp Counselor for him (Paul), and he auditioned but didn't get the part. However, they liked him, and knew he had gone to stunt school, so they asked him to be Jason.
A shot of the infamous double-impalement was cut to avoid an "X" rating, yet a gory still photo of this censored shot appears on the back of the videocassette box. The footage of the censored portion was finally recovered in 2020 from an old VHS of the gore shots that Carl Fullerton kept for his portfolio and was included on the Scream Factory deluxe collection of the films.