Spoiler warning. 　　When the main character's sister is pushed down the stairs, the killer breaks a glass of vodka next to her, to make it appear that she's been drinking. But right before she is killed, tells her sister's business partner (Teri Garr) on the phone that she hasn't had a drink in 4 days. Yet the police never mention the results of a toxicology report! And, the chara...