Continuity mistake: At the beginning, before Melanie walks behind the newsstand, it's an overcast day and she doesn't cast any shadow. As she emerges from the other side of the newsstand she casts several shadows against the wall and floor. The other people walking in front of the pet store are also casting shadows in several different directions. Throughout the film there are numerous changes regarding the casting of shadows between shots. (00:02:00)????
Continuity mistake: In the beginning of the movie when Mitch catches the yellow bird under his hat take a good look at the injury (subungual hematoma) he has under his left thumb nail. It takes weeks for these to go away, but Mitch's is gone when we see his left thumb again as he holds Melanie in the kitchen. (01:02:15)????
Continuity mistake: As the birds gather on the monkey bars behind Melanie she looks to her right and straight up and sees one lone bird flying past a television antenna. This is incorrect because first of all she's looking up to high and second we've seen in that direction and there is no house there, just a hill. The house is across the street. (01:11:10 - 01:33:05)????
Continuity mistake: As everyone runs into the house there are four neat stacks of paper cups around the punch bowl. When we saw this spot before there were only two cups around the punch bowl and most of the other paper cups were stacked on trays and knocked over as a bird plowed into them. (00:53:05)????
Continuity mistake: After Melanie hangs up the phone she sits and ponders whether to go to Cathy's party, on the desk to the left of the phone is the cigarette lighter that Annie left there before after she lit her cigarette. Next to it is a pack of cigarettes that she didn't leave there before. If you look closely earlier as she takes the cigarette out of the pack in the left pocket of her nightgown the lighter is in her right hand, the cigarette in her left and the pack stays in her pocket. (00:46:35)????
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)????