Revealing mistake: It is obvious that when Sam is in her bed reading her book with a torch, that a set light is being shone at her face and that the glow doesn't come from the torch, because she turns the torch away from her and puts it on the bed, but a soft glow of light remains on her face for some seconds. (00:20:20)
Continuity mistake: When the girls are at the diner, talking about how the waitress Wiladene is "off", Teeny has one hand on her Cosmo and one holding the pencil marking the answers, but in the next shot when Teeny says "What do you expect? She's a witch" her hand is just touching the edge of the table.
Continuity mistake: When the girls are riding their bikes to the library, Chrissy's hair is up in pig-tails with pink bows. In the next scene when the go under the train bridge, her hair is down without any bows. Then when they come under the bridge, Chrissy's hair is pulled back into the two pig-tails with bows. (00:28:25)
Other mistake: Watch when the bird poops in Chrissie's hair. From the camera angle above them, you can see that Chrissie not directly underneath where the bird is perched. The next shot shows the bird poop falling directly below the branch. The next shot after that shows the poop in Chrissie's hair. Judging by the position Chrissie was in, in relation to where the bird was, this is impossible.
Continuity mistake: In the beginning of the movie Chrissy is curling her hair, her hair remains tightly curled while in the house. When she goes out to greet the other girls her hair looks brushed out, definitely not tight curls. Then, when they all go inside, her hair is back to tight curls.
Visible crew/equipment: Chrissy sees the People magazine with Teeny's pic on the cover and asks Roberta why people get so excited over Teeny. When Roberta answers straightforwardly, in the next shot the shadow of the boom mic can be seen moving over the fridge, at the top of the screen. (00:05:40)
Continuity mistake: When Roberta falls over on the road after missing her dive onto Scott on his bike, a man ahead with a briefcase hurries across the road before one of the other Wormers can cycle into him, and another one of the Wormers cycles ahead of him. After Roberta vows revenge on the Wormers, and when Scott yells back at her, the man is seen crossing the road again at a steady pace with all four of the Wormers coming before him.