Audio problem: In the beginning, Claudette and the other counsellors are all singing. When they get closer you can see that Claudette is playing the guitar, then she stops, but the guitar playing and singing still continues. (00:02:10)
Continuity mistake: When Claudette and the counsellers are singing in the beginning, the close-ups of Claudette show her legs crossed, but the far-away shots show her legs spread apart. (00:02:10)
Continuity mistake: When Annie goes over to the dog and stops to talk to it, in the first shot the dog is in the sun, yet in the next shot it is completely shaded. (00:06:50)
Continuity mistake: When Annie talks to the dog, its position changes between shots. (00:07:00)
Audio problem: Annie walks over to a dog and says "Hi girl! Excuse me, hi boy!" Her lips don't move correctly to the line "..Excuse me.." (00:07:00)
Visible crew/equipment: When Annie goes into the shop to ask where Camp Crystal Lake is, you can clearly see the reflection of a boom mic in the window, above the head of the cleaner. (00:07:40)
Continuity mistake: When Annie gets into the bar and asks about Camp Crystal Lake, you can see the woman behind the counter standing leaning in at the end of it. Then two cuts later she turns around, suddenly standing by the cashier. (00:07:40)
Continuity mistake: While Annie is talking to the woman in the bar the guy that washes the floors (that appeared earlier standing on the other side of the counter) now stands behind the counter by the woman. When Annie is leaving the guy stands on his original position. (00:07:55)
Continuity mistake: In the shop Annie enters, the tissue dispenser and boxes move much further away from Enos between shots. (00:08:05)
Continuity mistake: When Enos is about to give Annie a lift he says "Ok kid, let's move", we see the red clothing going over her shoulder covering her bag's strap. When it cuts the strap is visible. (00:08:10)
Continuity mistake: The trees and scenery around and behind the truck, as we first see Ned, Bill and Marcie, changes bewteen closeups and wideshots. (00:12:00)
Revealing mistake: When Jack and the kids get up to the cabin you see Steve chopping on a stub in order to remove it. He then gets help from the kids to tip it over but there are no chop marks on it. (00:13:20)
Continuity mistake: When Steve is talking to Alice, and begging her to stay another week, he puts his hand up onto the roof as he talks. In the next shot his arm is down. (00:15:30)
Continuity mistake: When Alice runs to the lake to Bill she says "Bill, Steve wants to know if you need more paint", while holding her arm to her hip. When it cuts her arm is down. (00:16:20)
Continuity mistake: When Ned is aiming the bow at the girl the angle of the bow changes between the shots. (00:18:00)
Visible crew/equipment: When Pamela Vorhees pulls over to pick up Annie we can see a man's arm reflected in the front shield sitting in the passenger seat. (00:18:30)
Continuity mistake: When Annie is hitchhiking and the red truck pulls over she is standing in the shade. When it cuts she is standing in the sun. (00:18:30)
Continuity mistake: Just before Annie jumps out of the van, the truck is turning a bend. When the truck stops and backs up, the road is straight. It's a clearly new road. Also, the trees and leaves along the ditch have changed. (00:19:55)
Visible crew/equipment: When Annie jumps from Mrs. Voorhees' jeep, a white elbow pad can be clearly seen on her right elbow. (00:20:00)
Continuity mistake: As Annie backs into the tree, and then has her neck slit, her hair changes styles between shots, and the amount of leaves in her hair changes as well. (00:21:15)
Chosen answer: Just after the credits, there's a bank sign that says "Friday, 13 - 7:01 - 60 Degrees". Then the DJ says "It's 7:01 on Friday the 13th of June." and goes on to say some more about it and lists some other bad luck superstitions. At two other points in the movie, two characters (Ralph and Tierney) say "it's Friday the 13th". So there are at least four references to the fact that the movie takes place on Friday the 13th.
Myridon