Directed by: Mark Waters, Mark S. Waters
Starring: Rachel McAdams, Amanda Seyfried, Lindsay Lohan, Tina Fey, Lizzy Caplan, Lacey Chabert, Jonathan Bennett, Neil Flynn, Tim Meadows, Daniel Franzese
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." After she says this, her mouth visibly moves saying more words, but no audio is heard. (00:58:40)
Audio problem: When the Spring Fling Queen nominations are being announced applause can be heard for both Janis and Cady but no one in the class is clapping.
Continuity mistake: Cady breaks up her Spring Fling tiara that she receives. On stage, she breaks it up into many pieces and throws them out into the crowds; it is clear that the amount we see being thrown into the crowds is a major amount of pieces - almost too much from just one tiara. However then when she leaves the stage, we see her holding approximately half of the tiara still. This would not be possible from the aforementioned amount that Cady has already snapped off and thrown into the crowd. (01:25:15)
Question: After Cady sends a candy cane note to herself, pretending that it came from Regina, Gretchen says that Regina does not even like Cady very much. So why is Regina still allowing Cady to associate with The Plastics? As the "queen bee", she could probably decide to ban Cady from the group.
Answer: I think Regina secretly felt threatened by Cady. Janice and Damien comment about Cady being "a regulation hottie." She is attractive and has the "exotic" appeal of being a new student, plus she is new to traditional school in general, having spent many years in Africa. Regina guessed that Cady would have this exotic appeal. Pretending to be her friend was better than competing with her. It's a "keep your friends close and your enemies closer" tactic.
Answer: Regina enjoys manipulating people, and she views Cady as a relatively easy person to manipulate, finding her more useful/amusing to keep in their circle. It's a running theme of the film that the friendships between all of the Plastics is very tenuous, because of the catty, manipulative nature of the girls.
Purple_Girl
Also, if Regina tried to ban Cady, people might think she was threatened by Cady. Better to keep Cady around and attack her in subtle, manipulative ways.