Continuity mistake: When Jimbo gets his hand impaled on the counter with a corkscrew by Jason, the counter is clear, but a few scenes later as Jason leaves the kitchen, there's a pot holder laying on the counter.
Continuity mistake: Nurse Morgan's name tag is on the opposite side to the pocket with the pen in it, on her white nurse dress. Yet when Jason stabs Nurse Morgan, her name tag is right next to the pocket.
Continuity mistake: When Jimmy and one of the twin girls go upstairs, Ted is left behind with the other twin. He tries to give her a charming look while both his arms arm down. When it cuts from behind him he is suddenly holding his left arm up.
Continuity mistake: When two of the teens are dancing to the rock music, one boy walks over, changes the record and then places a vinyl record on top of a box. In the next closeup the vinyl record he placed down has gone.
Continuity mistake: After Tommy slices Jason in the head with the machete, he picks the machete up, and in this shot his shirt is dry. In the next shot when Trish goes over to hug him, his shirt is wet, then dry again.
Continuity mistake: When Tommy is pretending to sleep when his mom comes into the room, he is on his stomach when she pulls the blanket over him. In the remaining shots starting with when his mom is closing the blinds, Tommy is suddenly laying on his side.
Continuity mistake: When Jason kills Doug in the shower, there are two red lines on his hockey mask, under the eyes. However later, when Jason bursts through the window and grabs Tommy, the lines are gone.
Continuity mistake: Jason slashes Jimbo in the face with a cleaver. It then cuts to another scene happening elsewhere. Then when it cuts back to the scene with Jimbo, Jason now has a large bloody knife instead.
Continuity mistake: When Trish is inching by Jason lying on the floor, in one shot she steps over his arm and her feet are near his shoulder, then in the next shot it shows her stepping over his arm again.
Continuity mistake: When Sam asks Sara to come into the water, Sara says no. Then Sam says "Then I'll go under water and stay there until you do", while placing her hands on the edge of the pier. When it cuts to a close-up of her she is resting her arms on the pier instead.