Continuity mistake: While the girls go wild in the hallway, the principal breaks the glass with a bat making the sprinklers come on. When he yells, "All junior girls report to the gymnasium immediately," in the following shots all their shirts are dry.
Revealing mistake: When Ms. Norbury spills coffee all over her shirt, you can see the hand that is to the left is pulling her shirt up with her sweater and rapidly lets go.
Continuity mistake: In the winter talent show scene, you see Gretchen go to kick the boom box in hopes of fixing the skipping CD, but when she kicks it you see it start to just fall off the stage. Yet in the next shot the CD player shoots forward and hits Gretchen's boyfriend, as if she had kicked it a lot harder than she actually did.
Other mistake: When Ms Norbury passes back the failing grade on the math tests and states she needs it signed by her parents, the test states it's the "Limits Test" but the test is on convergence and divergence of infinite series.
Factual error: The mall that the plastics state they are going to, Old Orchard as stated by Cady, is an outside mall. However, the mall they go to is an indoor mall.
Continuity mistake: In the Spring Fling scene, when Cady and Aaron are dancing, it alternates shots between Cady's face and Aaron's. Her arm is on his shoulder in one shot and the next shot it is on his arm. This happens a couple of times in the same section of that scene. Really obvious.
Continuity mistake: When the girls are rioting a boy gets on his mobile phone asking his mother to come and get him because he is frightened. The same girl in the stripy top and denim skirt runs down the stairs behind him twice within a few seconds.
Continuity mistake: When Cady enters the dance after the Mathletes competition, her sleeve is down past her arms and we cannot see her hand. In the next shot, the sleeve is rolled up and her hand is visible.
Other mistake: When the girls are going wild, the two Vietnamese girls, who made out with Coach Carr, fight and argue. There is a subtitled translation at the bottom of the screen and one of the girls' lines is translated as "Your the slut." This should have read, "You're the slut."
Revealing mistake: In the scene where Mrs George is taking pictures of the girls for the Christmas concert you can see that the camera is turned off.
Factual error: While the plastics are at the mall there is a Bell Mobility booth seen behind them. This booth wouldn't be found in an American mall as they only service Canada.
Deliberate mistake: When Cady is breaking the 'plastic' crown into bits and throwing the pieces to people in the crowd, it's not possible to have that many pieces from that one crown. She must give out at least 7 or 8 big chunks, which just doesn't truly reflect the size of the crown.
Visible crew/equipment: When Damien and Janis drive off leaving Cady on the sidewalk with a picture, a large square stage light on the set is reflected in the window of the back car door (probably one which lights the ground to give the effect of a streetlight). It is too large and bright to be one of the lights from a house across the street.
Continuity mistake: Just before Regina gets run over by the bus, watch her hair. It changes from on her shoulder to behind her neck between shots.
Continuity mistake: When Cady is at the Halloween party her face is painted white/gray. when she comes through the door to see Damian and Janis her face has changed from white/gray to a more green.
Other mistake: The word Artist is spelled "Artitst" on the senior artist credit.
Continuity mistake: In the wings after the Jingle Bell Rock dance, Aaron has his arms around Cady and Regina. Just as Kevin leaves we can see Aaron's hand is on Cady's shoulder, but in the next shot it is down by his side.
Continuity mistake: In the scene near the end of the movie, where Janis is dancing with K.G., after Janis tells him that she's Lebanese, she smiles. The next shot, she's not smiling.
Continuity mistake: When the Regina posts the Burn Book around school the "wanna-bees" are fighting. One girl goes, "You bitch!" and the other goes "You're the bitch!" and they start to fight. While they are fighting they jump onto a table and it breaks. If you look into the backround, you see Jason and his 2 friends turn around because they heard the noise of the table breaking and the girls fighting, and Jason's friend on the right puts his hand on Jason. When the camera changes shots his hand is on his heart.
Continuity mistake: When Regina is by her car after Cady's party, Regina says something about the Caltine bars and her boyfriend says that they are for weight gain. Regina spits it out and at one point you can see her boyfriend putting his cup up to his lips, then the shot changes to the other side of the car and his arms are down straight.
Answer: Precisely because he was sleeping with a student. Getting her pregnant would bring their affair out into the open and create a scandal for the whole nation to know what he was up to. Therefore safe sex was really important to him.
The_Iceman
True, but since he was spending time with her, he could make sure that birth control was being used (i.e. him using a condom). I think he was trying to appear "uptight" about sex, so he could be the least likely suspect.