Factual error: At the climax of the movie, Alice swings the machete at Mrs. Voorhees and decapitates her. When the blade makes contact with Mrs. Voorhees' neck, her head flies off at an incorrect angle, as though the cut began on the opposite side.

Friday the 13th (1980)
Ending / spoiler
Directed by: Sean S. Cunningham
Starring: Adrienne King, Betsy Palmer, Jeannine Taylor, Robbi Morgan
The killer is really Mrs Voorhees (Jason's mother) who kills anyone who tries to reopen Camp Crystal Lake where her son drowned. But she gets decapitated by the final girl Alice Hardy after a final battle / showdown on the shore of the lake.
Mikey D
Crazy Ralph: You're doomed! You're all doomed.
Trivia: In the scene where Alice finds Bill's body hanging on the back of the door to the generator room, the producers purposely did not tell Adrianne King what they were going to do to the body nor did they let her see the body beforehand. When she saw the body during filming it was for the first time. The scream she produced was genuine as it scared her badly. Needless to say, that entire scene was shot in one take.
Question: I just watched this movie for the first time and I have three questions that are really confusing me. When Alice is in the cabin and that dead girl comes through the window, (I forgot her name), how did that girl die? All I saw was blood and ropes on her so I was wondering what happened. When Mrs. Voorhees is with Alice just before she tries to kill her, we see her repeat "Kill her mommy. Kill her", so I was wondering if Jason was possessing her or not? When Jason, as a kid, comes through the water and grabs Alice in her dream, he's disfigured and burnt. How could that be if all he did was drown? If anybody can explain all my questions with great details, I would really appreciate it.
Answer: Brenda was her name. And I think that she was stabbed. Or strangled. Or beaten to death. However as her murder was offscreen we will probably never know. What we do know is that she screamed before she died. Bow and arrow? (She was last seen at the archery range).
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Answer: 1. She was most likely hanged. 2. Mrs. Voorhees wasn't possessed by Jason. She simply went insane when Jason drowned and wanted revenge. 3. He's not burnt, only disfigured.