Revealing mistake: When Inigo and Westley are duelling, they are making athletic jumps. One does it after the other and when they land you can see the mat wrinkle under the "dirt" on the ground.
Revealing mistake: When Goldie Hawn pushes Kurt Russell off the boat you can see he has flippers on in the water.
Revealing mistake: After Johnny leaves, they show Baby standing on the porch of her family's cabin. If you look in the background you see two people waiting for their cue before they start walking. (01:24:30)
Revealing mistake: When Julian uses a credit card to open the sliding glass door at his parents' home it's obvious that there is no latch or lock where he inserted the card when the door opens.
Revealing mistake: When David drives through the outer wall of the bakery products store, in the side shot the wall first bends, then it breaks as the car goes through. Also, the next back shot is a repetitive action, although the window breaks quite differently in both shots. (00:50:45)
Revealing mistake: During the car chase scene the cops shoot out the rear window of the convicts car, it is obvious that someone smashes the window with a hammer or crowbar from inside the car.(view in slow motion).
Revealing mistake: At the New Years Eve Party, Cindy gets drunk and starts looking for a bedroom to lay down in. As she opens bedroom doors, she interrupts couples making out. When she interrupts one couple there is a shoe thrown at the door, supposedly from inside the room. If you look closely you can see that the shoe is actually thrown from behind Cindy's head outside the bedroom door.
Revealing mistake: When Shoop first meets his students, he asks the pregnant girl why her grades went from A's to C's, and she stands up to reveal that she's pregnant. When she does, she pats her tummy once and it makes a loud, hollow sound like someone smacking a basketball.
Revealing mistake: After CD has swoon Roxanna for Chris, Charlie falls out of a tree in front of the old ladies. If you look close you can see a darker patch of grass that CD falls in. It's clear it's placed there as a soft landing pad for the stunt man to hit.
Revealing mistake: When the plumber is climbing out of the very snow covered well, the snow on top never shifts - an impossibility considering the actor's size and weight. The snow on the ground moves as expected. (01:05:10)
Revealing mistake: When Caleb shows Mae his horse and it rears you can see the man holding the horse's rope is not Caleb. The man has an older, redder face and greyed sideburns. (00:08:21)