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Continuity mistake: Captain Willard picks up one of the death cards that Lt. Col. Kilgore threw on a dead body and it's the seven of hearts. This is not one of the cards that Kilgore threw down though. As he was naming each one as he threw it and Captain Willard was walking close behind him. (00:28:05)

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Continuity mistake: As Colonel Kilgore gets into his helicopter the trumpet player is standing right there next to it blowing charge. In the next shot as the helicopter takes off he's not there. (00:34:50)

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Continuity mistake: Kevin Costner jumps a subway turnstile as the two CIA agents chase him. The back of his pants are dirty but in the next shot as he runs down the escalator they're clean again.

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Continuity mistake: When Rosemary is playing Scrabble the angle of the shadow of her head on her collar changes between shots. (01:29:00)

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Continuity mistake: As they look across the bay at Mitch's house, the store manager changes position between shots. He moves closer to Melanie as he asks her if she wants him to order a boat for her. (00:14:10)

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Continuity mistake: The signature on the card that Melanie signs to Cathy in the close-up on the hood of the car is different when she leaves it leaning on the birdcage at Mitch's house. The "Y" at the end of her name is different on the two envelopes. (00:18:55)

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Continuity mistake: After talking to Mitch on the phone, as Melanie sits behind Annie's desk there are two pens on top of the sheets of paper to the left of the pencil holder that were not there before. Neither Annie or Melanie touched a pen or pencil in this scene. (00:46:40)

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Continuity mistake: After Mitch closes the shutters, the chair from the desk pushed further away to the left of where Lydia and Cathy are sitting and they haven't moved it or moved from where they were sitting. (01:44:05)

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Continuity mistake: The front of and a lock of hair below Annie's right ear is combed differently between shots as she smokes a cigarette with Melanie and tells her that Mitch's sister's name is Cathy. (00:17:00)

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Continuity mistake: As they all run into the house to get away from the birds the redheaded boy in the grey-blue suit disappears. He runs across the lawn at the same time as Annie and the two little girls with her and should arrive at exactly the same time but we never see him again. Mitch even looks around in his direction to see if there are any children still outside before he enters the house. The boy just disappears from this scene and is not in the last shot of everyone inside the house either. (00:53:00)

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Continuity mistake: When everyone begins running down the hill Melanie is in the middle and Annie is in the back. We're watching continuous action but several seconds later Melanie jumps to the rear without ever being passed by Annie. (01:13:45)

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Continuity mistake: At the party the tablecloth is blowing under the table in the long shot as everyone runs toward the house. In the next shot as they enter the house it's not blowing and there is no wind at all. (00:53:00)

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Continuity mistake: Inside the restaurant Melanie talks to her father on the phone at the bar. The phone's chord changes position between shots. At first it's resting on her sleeve then in the next shot it's on her forearm. (01:15:45)

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Continuity mistake: As Melanie opens the door to the bedroom there is no light except her flashlight but you can see two distinct reflections in the door knob, one of the flashlight and one of the studio light behind her. (01:47:15)

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Continuity mistake: During the party as they walk up Mitch's hill Melanie has two swizzle sticks in her glass that switch to her left hand as they get to the top of hill. (00:48:10)

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Continuity mistake: As Mitch walks up to the garage door all the birds on the ground that are near him run away and there's nothing to his right except a garbage pail. Then just before he walks through the door two birds appear pecking at his feet. (01:53:00)

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Continuity mistake: Early in the movie Melanie makes a right turn as she goes up to Annie's house and we see a white post on the school side of the street and a stop sign on the opposite side. Now as she drives up to the school to check on Cathy we see the exact same spot and there's no stop sign. (01:08:10)

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Continuity mistake: In an earlier scene as Melanie plays the piano and Cathy stands there look closely at the drapes on her left. In that scene the drapes were right up against the edge of the wall, now as Mitch checks the windows before the last attacks they're pushed back several feet. (00:57:30)

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Continuity mistake: As Melanie drives up the main street of Bodega Bay a kid on a bike appears riding behind her between shots. He wasn't there in the previous shot when they show her behind the steering wheel and we can see back behind her car. (00:12:05)

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Continuity mistake: When Mrs. Bundy tells Melanie that there is a difference between crows and black birds Deke's right arm is leaning on the recessed edge of the bar close to his body. In the next shot his right arm is moved closer to Melanie, placed in the middle of the bar. (01:16:30)

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