Revealing mistake: In the swimming pool scene between Annette and Sebastian, a positioning mark can be seen quite clearly on the floor. [The swimming pool used was freezing cold, about 40 degrees, so Ryan Phillippe and Reese Witherspoon were freezing (look close and you can see Ryan shivering), and so were the camera crew, that they didn't repeat the shot, so the positioning mark was left in.] (00:28:05)
Continuity mistake: In the final scene where Annette is driving the Jaguar and having flashbacks, watch as she drives past lovely rolling hills and pastures. Cut to a helicopter shot of her driving the car along a New York freeway (FDR I think...) This mistake has been confirmed by the director. (01:33:35)
Kathryn: So I assume you've come here to make arrangements, but unfortunately, I don't fuck losers.
Trivia: Contrary to what some people think, Ryan Phillippe and Reese Witherspoon didn't meet while filming this movie; they were already dating. The director, Roger Kumble, asked Phillippe if they could have dinner with Witherspoon and offer her the role of Annette.
More questions & answers from Cruel Intentions
Answer: Sebastian could have had a will and left it to her. Plus she was likely either in jail or rehab after being caught with cocaine, leaving her with little power to do anything about it.
LorgSkyegon