Continuity: After the Halloween party, when Cady walks into Damian and Janis' house, Damian gets scared and tosses all of the popcorn out of his bowl. In the next shot of Damian his bowl is full again. (Timecode)

Continuity: When Regina becomes angry, and writes the horrible message in the burn book about herself to frame Cady and the others, the handwriting changes between shots. Look at "DO NOT TRUST HER" and "She is a fugly slut." - The handwriting changes noticeably, and "fugly slut" changes a lot - she writes it so the "g" and "y" have curled ends, yet it cuts to her sticking her photo in, and the ends to the tails on the "g" and "y" are straight. The line under "fugly slut," and the exclamation mark both change too. (Timecode) Submitted by Hamster

Continuity: When Cady runs into her teacher on the first day of school and spills coffee all over her, look at Tina Fey's pants. It looks like she is wearing rubber pants when the coffee is spilling down her front. The color of the pants also change during this shot. (Timecode) Submitted by Lynette Carrington

Continuity: In the scene where Karen is explaining to Cady (Lohan) how her breasts can tell when its going to rain, you see a shot of both of them and Cady is beginning to smile/laugh, but then it cuts to just Cady and she has a straight face again.

Continuity: When Cady, Janice and Damian are in class talking about different things, like watching a movie, and Cady tells Janice she can't see her art show because she going to Madison etc., Cady is applying lip gloss. She holds a pocket mirror and in shots of the mirror you can see Cady holding the pink tube of lip gloss in the same hand, then when it cuts to wideshots, the tube isn't in her hand. The pink tube of lip gloss also has no lid on it, yet near the end of the scene a blue long lid appears on the pink tube. (Timecode) Submitted by Hamster

Continuity: When the principal is introducing Cady to the class, the amount of donuts on the desk changes between shots. In some shots there are two donuts on top of the donut box, and other shots there are no donuts.

Continuity: When the main character is confronted by her crush in her room, she puts her drink on a pile of CDs, the CD pile starts to fall in the background as there is a shot of the guy, a split second later the cup is on the table next to the CDs, and the CDs are piled differently. (Timecode) Submitted by nicholmikey

Continuity: When The Plastics go to Regina's house for the first time, Karen walks over to the counter to put her bag down twice. (Timecode) Submitted by Hamster

Continuity: On Cady's first day at her new school, she walks toward the front entrance through a crowd of kids. A Black girl with a green comb in her hair approaches Cady from the right and passes without incident. Yet in the very next shot, the same girl again approaches Cady and purposely bumps into her. (Timecode)

Continuity: On Cady's first day of school, she introduces herself to a student who she thinks is the teacher. If you look directly behind them, there is a girl with a white sweater and blonde hair walking in front of the blackboard who almost reaches the end. The shot changes and the girl is farther away, then it happens again in the next shot. (Timecode)

Continuity: At the Spring Fling, Cady breaks the small tiara into many pieces and then leaves the stage with half of the tiara. It's obvious she didn't break up the same tiara she received, but obviously used a different tiara for all the broken up pieces, because there's no way she could get all those pieces from half the tiara. (Timecode) Submitted by Hamster

Factual error: During the scene where 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 invergence and divergece of infinite series. Submitted by Ian Mugford

Audio problem: When Janis shouts at Cady out of Damian's car, Cady says "It's not my fault you're like in love with me, or something.", and then after she says this, her mouth visibly moves to more words but no audio is heard. (Timecode) Submitted by Hamster

Continuity: When Cady is talking to Regina on the phone, and Regina says she thinks someone nominated Gretchen as a joke, she is eating a chocolate donut. Between shots the bites in the donut completely differ. (Timecode) Submitted by Hamster

Factual error: The snake that Cady's dad is shown holding in the clips from Africa is a Burmese python. These snakes are not found in Africa. Submitted by Ian Mugford

Revealing: Regina writes comments about herself in the Burn Book, at the top of the page in red marker. Later, when Mr DuVall has the book, he opens in saying "Why would Regina refer to herself..." and he then looks at the page and reads "... as a Fugly Slut?" However, watch as Mr DuVall opens the Burn Book - the page he has it opened at it blank at the top and there is no writing on it at all. (Timecode) Submitted by Hamster

Continuity: 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: 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.

Factual error: The mall that the plastics state they are going to, Old Archard as stated by Cady, is an outside mall. However, the mall they go to is an indoor mall. Submitted by Ian Mugford

Other: The word Artist is spelled "Artitst" on the senior artist credit. Submitted by Ian Mugford