Question: I am aware that this is not a mistake (possibly a deliberate one) but I just had to ask: As Warner is about to say "I want to break up" and Elle thinks he is proposing, she says "I do". Assuming he was going to propose, wouldn't her answer need to be "Yes" in response to "Will you marry me?" which is the proper way to propose?
Answer: It was probably not something to make sense in the movie world but more to make sense to the audience. If she simply said yes it could make it kinda ambiguous and maybe some people wouldn't catch on what she really thought was going on. But the words "I do" are highly associated to marriage so it would make it easy for the audience to know she thought he was proposing.
Question: In the scene in the library, where Elle gets turned away from Vivian and Warner's study group, she and Enid get into an argument, where Enid remarks, "Like when you called me a d*ke and then voted against me?" to which Elle then accuses Vivian of saying it. What scene are they talking about?
Question: Who is Vivian's friend that's always hanging out with her? I don't think her name is ever mentioned in the film.
Answer: I don't recall her name mentioned in the film either, but after a look on IMDB, I believe the actress is Samantha Lemole, who is credited in the movie as 'Claire'.
Answer: Maybe she was getting a little ahead of herself, already picturing the ceremony. It was (supposed to be) the happiest moment of her life, and she might be understandably flustered.