Trivia: There are three different hockey masks used either in this film or its advertisements. The first is the one that the Jason impostor (Roy) wears. It has two blue triangles below the eyes. The second is the one the real Jason wears when Tommy sees him in the hospital room at the end, with the red triangles. The third is featured on the poster. It has an un-holy amount of breathing holes on it. (01:23:00 - 01:27:10)
Trivia: Richard Donner, the film's director, has an uncredited cameo appearance as a police officer, on the beach at the end.