Continuity mistake: During the big sex scene you see red marks on Michael Douglas's back. These red marks are from when Sharon Stone scratches him. The thing is, she scratches him a minute AFTER you see the red marks on him for the first time.

Basic Instinct (1992)
Ending / spoiler
Directed by: Paul Verhoeven
Starring: Michael Douglas, Sharon Stone, Jeanne Tripplehorn, George Dzundza
Although you find out that the detective's girlfriend, Beth, the psychiatrist played by Jeanne Tripplehorn, had an unhealthy obsession with Sharon Stone, it turns out that Sharon Stone is the murderer... the last shot is the ice pick under her bed. Also that was Catherine Trammell and not Beth murdering the guy in the opening scene. Catherine framed Beth for it all.
Dion
Beth Garner: Something's going on. You're sleeping with her, aren't you?
Nick: Why are you interested in her?
Beth Garner: My interest is in you, not her. She seduces and manipulates people. She'll do anything she can.
Nick: I thought you hardly knew her?
Beth Garner: I know the type. I'm a psychologist.
Nick: That means... you manipulate people too! You're a practicing psychologist. You're better at it than she is.
Trivia: Before Sharon Stone was cast as Catherine, Michelle Pfeiffer, Julia Roberts, Kim Basinger, Kelly McGillis, Greta Scacchi, Emma Thompson and Mariel Hemingway all turned down the role.
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Answer: She is portrayed as a psychopath with an uncontrollable urge to kill.
raywest ★
I wouldn't say that she had an "urge" to kill. Rather, she was willing to "dispose" of people by killing them. She would kill people who were in her way or were no longer interesting/useful.