Friday the 13th (1980)

◄ Friday the 13th (1980)

Audio/visual unsynchronised

When Claudette and the counselors are singing in the beginning, the music continues after she stops strumming the guitar strings.
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When Alice is lying down on the couch and is having a conversation with Bill, we see neither her, or Bill's mouth move.
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Character error

When Alice runs back into the cabin after discovering Bill, she starts piling things in front of the door even though it opens outwards.
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Continuity

While Annie is approaching the dog at the gas station, the dog is looking directly at Annie. In the close-up, the dog is looking back behind him as Annie takes off her backpack and starts to talk to the dog.
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The close up shots of Claudette singing show her legs crossed, but the long shots show her legs spread apart.
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When Annie trips in the woods and backs up against the tree, her hair and the amount of leaves in it changes in every shot.
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When everyone is looking for the snake, first Alice lifts up the sheet, then in the next shot, Marcie lifts up the sheet and Alice is behind her.
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Ned is eating a hamburger when he runs to Alice's aid, but the hamburgers aren't cooked until the next scene.
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Just before Jack's death, he is smoking and his arms are in front of him. When it cuts to the side shot of him being stabbed, his arms are stiffly at his sides.
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When Sgt Tierney is giving Steve a ride, he gets a call on the radio. As he replaces the receiver, he flips on the lights. In the next shot, the lights are off and are turned back on again.
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When Alice is alone making coffee, on a table behind her is a mixer and a basket of eggs. When Alice returns (after discovering Bill's body) the basket and the mixer have switched places.
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When Alice runs into the boathouse to get the gun, there are several pieces of wood leaning on the right side of the boathouse. As Alice opens the door and enters, one piece falls diagonally, but in subsequent shots it is back in its original position.
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When Jack and Marcie are in bed together, the close-ups show Jack's hand up near Marcie's neck, but in the side shots they are by her body.
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When Alice wakes up on the couch, she is wearing white socks. When she walks into the kitchen to make the coffee, her feet have a dark color (either dark socks or shoes).
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When Ralph is leaving on his bike, he passes the same rock in the road twice.
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When Alice goes back to the cabin and stares at Brenda's body, it's simply a flipped version of the same shot shown before: Brenda's head is now tilting in the opposite direction, and her wounds have switched sides.
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When Alice runs into one of the houses before Pamela chases her in there, she shuts the blind on the right window next to the door. When she gets chased out of the house, you see the blinds open again.
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During the scene when Steve gets picked up by the officer, the officer turns on the police lights to show where the car is. In long shots the lights are on but when we see the close up of Steve talking to the officer the lights are off. And then back on again but the officer turns them off as they drive away.
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Annie tells the truck driver she will cook for 50 kids, but later tells the jeep driver she doesn't like to call children "kids".
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Although the Jeep is traveling at a high speed Annie rolls only once and she gets off after she leaps from it.
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When Alice reaches the canoe, it is relatively dry inside. There a major downpour less than an hour earlier, which should have partially flooded the canoe.
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(At 40:41) When Jack and Marcie have finished making love, there are blood spatters along the right edge of the pillow, which are presumably from Ned in the upper bunk. But when Jack is killed with the arrow up through the neck and throat, the blood spatters are gone.
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When Mrs. Voorhees breaks into the pantry where Alice is hiding, Alice ducks her machete swing, then uses a cast iron skillet to block the blade. However, the position of the skillet changes just before she knocks Mrs. Voorhees out with it. At first Alice blocks the machete to her left, but in the very next shot she takes a swing at Mrs. Voorhees head and the skillet is now on her right.
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Crew or equipment visible

When Annie enters the coffee shop you can see a boom microphone reflection in the window just below the reversed Coke sign.
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Miscellaneous

When Brenda rolls the dice to start the strip Monopoly game, she says she rolls double sixes and gets to roll again, but you can clearly see the 1 and 2 she actually rolled.
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In the French translation of the movie, Mrs. Voorhees calls her son Jackie, even if the character is named Jason in the English original version. The translation was corrected in Friday the 13th Part 2.
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Many early prints of the film feature a large, black line running from the top to bottom of the frame when Marcie is checking the showers. It has since been digitally removed in recent DVD/Blu-ray releases.
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Incorrectly regarded as goofs

Brenda uses the communal bathrooms rather than the sink in the room because of facilities available there other than a sink.
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Revealing mistakes

The lightning on Marcie and Jack is merely a yellow light being flashed at their faces; real lightning has a bluish tint.
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Outside the diner, it is obviously a fire hose being sprayed back and forth to create the "rain."
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In the last scene, after the nurse gives Alice a shot, she briefly looks directly into the camera.
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In the Uncut Version, when Alice discovers Bill hanging on a door, his mouth and right eye can be seen twitching, close-up. (In reality, the actor, Harry Crosby, was wincing in pain from incorrectly-applied gore makeup on his left eye).
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Spoilers

The goofs below may give away important plot points.

Continuity

The hands that reach up and grasp in front of Mrs. Voorhees's
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Continuity

Mrs. Voorhees' arm positions change when she is lying on the
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Factual errors

At the end when Alice cuts of Mrs. Voorhees's head you can see two hands clutching and making fists in the air which is not possible as the brain is disconnected so as to make the hands perform a voluntary function. An involuntary action would have been a jerky movement.
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Factual errors

The date in the beginning says June. In the end, if you look at the trees, and the reflection in the pond before Jason grabs Alice, it appears to be Autumn.
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Revealing mistakes

Obvious dummy during the climactic decapitation. Alice swings
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Revealing mistakes

When Mrs. Voorhees throws Alice onto a table, you can see a mattress under it catching her fall.
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Revealing mistakes

When Alice screams and swings the machete at Mrs. Voorhees, you can
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Revealing mistakes

When the head of Mrs. Voorhees is severed you can clearly see the toothpicks that were holding the fake head to the false body sticking out of the neck stump.
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