Continuity mistake: At the end, while Billy chases Kelli, Kelli knocks over a cart of surgery supplies, spilling the material forward. However, a few shots later, Billy is shown picking a scalpel up from the small tin pale, which slid ahead of Kelli. So how could Billy have picked up the scalpel if he was behind Kelli?
Black Christmas (2006)
Ending / spoiler
Directed by: Glen Morgan
Starring: Mary Elizabeth Winstead, Michelle Trachtenberg, Lacey Chabert, Katie Cassidy
Most of the murders commited in the house were not by Billy but his half-sister/daughter Agnes, hence her M.O. of duct taping her victims heads, then gouging out their eyes (which is what Billy did to her back when she was eight). By the end of the night only Kelli is still alive, Kyle and Leigh having joined the other deceased house occupants. Billy dies of his burns as his home goes up in flames while, Agnes is electrocuted when the paddles on a defibrillator on max power is used on her head.
MOVIEWATCH
More mistakes in Black Christmas
Ms. Barbara MacHenry: Didn't I see Clair earlier?
Kelli Presely: Isn't she upstairs writing a card to her sister?
Melissa Kitt: No, I think her sister picked her up earlier. Remember, this is the occasion for Clair and her sister and her mom to bury the hatchet and rediscover each other.
Dana Mathis: I'd like to bury the hatchet with my sister... right in her head.
Trivia: The sorority mom, Andrea Martin, is also one of the girls in the original "Black Christmas". Her name in the original was Phyllis.
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Answer: I always thought that the cops put two and two together and then this became the stuff of legend.
ChristmasJonesfan