Deliberate mistake: When they are listening to the tape, Cheryl yells out and shuts it off. Scott says he wants to hear the rest of it, but then deliberately fast-forwards it a bit before starting it playing. If he wanted to hear the rest of it, why does he skip part of it? This allowed Cheryl to shut it off as soon as she finished her line/action, but then Scott could fast-forward it past a mark on the visible reel-to-reel tape so it would start immediately on the chanting rather than in the middle of the lecture where Cheryl stopped it.
The Evil Dead (1981)
1 deliberate mistake
Directed by: Sam Raimi
Starring: Bruce Campbell, Betsy Baker, Ellen Sandweiss, Richard DeManincor
Visible crew/equipment: When the people are driving over the bridge at the start, it goes to a shot of the front of the car. To the right of the car you can see a crew member holding a still camera.
Trivia: When they are preparing and listening to the tape you can see a bit of smoke in the air. There had been an extended scene where they had been smoking pot and joking around. However, they used real pot when filming and much of what was shot ended up being unusable as a result. This is according to Bruce Campbell's Commentary to the DVD.