* AlternativeCharacterInterpretation: [[spoiler:Is Jason's ghost really talking to Pamela, or is she just delusional?]]
* SugarWiki/AwesomeMusic: Harry Manfredini's score for the film seems like "generic" slasher film music today thanks to the SeinfeldIsUnfunny effect, but that's because it was arguably as memorable and inspirational as Creator/JohnCarpenter's ''Franchise/{{Halloween}}'' theme.
* BigLippedAlligatorMoment:
** When a policeman shows up at the camp looking for Crazy Ralph, it is badly timed to Ned running out of the cabin dressed as an Indian, screaming and dancing around. He says "oh shit" when he spots the cop but the characters don't bat an eyelid. It adds nothing to the plot and is just so random.
** There's a conversation between Jack and Marcy that has nothing to do with anything really and has no impact on the plot. Just before going into the bunks to do it, they have a talk by the lake. Marcy tells Jack about a dream she frequently has where it's raining and the rain turns to blood.
** Right before she's killed, Marcy is in the outhouse and randomly looks into the mirror to do a Creator/KatharineHepburn impression, quoting ''The Rainmaker''.
* CriticalDissonance: Critics more or less hated it, but it went on to be one of the biggest slasher films ever made.
* EnsembleDarkhorse:
** Believe it or not, [[spoiler: Jason Voorhees. He's dead and only appears in a dream sequence and flashback, but is one of the most memorable parts of the film. So much so he became the BigBad of the franchise starting with the second film and became one of the most iconic slasher villains of all time.]]
** Crazy Ralph is very memorable among viewers thanks to his over the top paranoid demeanor.
* EpilepticTrees: Before [[spoiler: Brenda]] dies, she's lured to her fate by the sound of a child calling for help. When we see [[spoiler: "Jason" talking through Pamela's voice, Pamela just uses a slightly higher version of her voice, nothing like the child]]. Another thing to note is that when [[spoiler: Brenda's body gets thrown through the window]], it would have been difficult for [[spoiler: Pamela to run to her Jeep from that distance from the cabin right before she meets Alice]]. When [[spoiler: Pamela sees Brenda's body]], she apparently feigns innocence by wondering who did that to her before [[spoiler: immediately dropping the act to chase Alice]]. This has led some to theorize that [[spoiler: it was actually Jason that killed Brenda rather than Pamela]].
* FirstInstallmentWins: While there are several fans who prefer the fourth or sixth film over the original, this is widely considered the only genuinely good film in the series and the one critics are most likely to give good remarks on.
* ItWasHisSled: By now, the twist regarding the killer is pretty well known, especially thanks to the opening of ''Film/Scream1996'' famously spoiling it.
* JerkassWoobie: [[spoiler:Pamela Voorhees. The novelization implies she only went on a killing spree to save further campers from Jason's fate.]]
* NarmCharm: [[spoiler:Mrs. Voorhees alternating her voice between her own and "Jason's", due to it selling how far gone she is]].
* OneSceneWonder:
** Crazy Ralph appears twice in the film, and steals the show both times.
** [[spoiler:Jason Voorhees in Alice's pre-ending-nightmare, which has him rising from Crystal Lake, dead and rotting, and pulling her under the surface]].
* SeinfeldIsUnfunny: Averted. Although the end of the film ripped off ''Film/{{Carrie|1976}}'' which has become an example of the trope, fans do find the ending to the film scary.
* SpecialEffectsFailure: Offscreen lightning strikes are simulated by flashing lightbulbs at actors.
* TearJerker: [[spoiler: The villain isn't Jason, but rather his mother Pamela, who went completely insane after the supposed "death" of her son. Then the ending and the sequels reveal ''he was never dead to begin with'', meaning her horrible deeds accomplished nothing -- except to inspire an innocent child to become a violent serial killer in her name.]]