Continuity mistake: Melanie hasn't been near her car since the attack on the children at the school. Now as she and Mitch pass it while walking to Annie's, we can see the front wheels have been turned all the way to the right.
Continuity mistake: As Melanie watches Mitch from out on the boat, someone opened the shades on the left lower window of the house. In the next shot as Mitch watches her with the binoculars the shades are closed again.
Continuity mistake: When Melanie first reaches into her pocketbook for the card she's about a foot away from the cage. In the next shot as she puts the card against the cage her pocketbook is practically touching the seat.
Continuity mistake: At the end of the bird attack Melanie gets Lydia and Cathy out through the side door. If you look to the left of the screen the wall behind and around the lamp where the painting hangs is dark. In the last shot of the birds flying around the painting is lit.
Continuity mistake: During the bird attack, Lydia and Cathy start running towards the dinner table and the drapes to the left of the door are pitch black. The next time we see these drapes they're lit up.
Continuity mistake: As Annie goes across the room to get an ashtray, you can see that the next room is pitch black. In a previous shot when she went to get the brandy it was lit up and she never touched a light switch.
Continuity mistake: As Mitch runs to get the hammer and nails for the front door notice the top leaf of the fern plant to his left. It gets rearranged in the next shot, as Melanie watches him, with one fern sticking out from the middle that wasn't there before.