- Andrea Martin, who played Phyllis in Black Christmas (1974), said in an interview that she hadn't thought about Black Christmas for 32 years and it "came out of the blue" when Glen Morgan offered her the role as the house mother in the movie.
- Glen Morgan approached Mary Elizabeth Winstead about the movie at 4 AM in the airport after finishing Final Destination 3 (2006) with her. After being hesitant at first after only just finishing a horror movie, she agreed to the role of "Heather" because she is a fan of the 1974 version.
- Crystal Lowe's first leading role.
- Glen Morgan wanted either Margot Kidder or Andrea Martin (who were both in the Black Christmas (1974)) to play the house mother in this movie, to pay respect to the 1974 version.
- Glen Morgan didn't specifically have any male actors considered for the role of Kyle in the movie. Instead, during auditions, his 14-year-old daughter (stepdaughter of Glen's actress wife Kristen Cloke, who also has a role in the movie), picked out Oliver Hudson shouting out "That one!"
- Lacey Chabert injured her leg on the first day of shooting. The actress flew back to Los Angeles to see a doctor, and coincidentally enough, the doctor who treated her was the stepfather of her co-star, Katie Cassidy.
- Kristin Cavallari turned down the role of "Kelli" while Camilla Belle and Amber Tamblyn turned down the role of "Heather" due to scheduling conflicts. Belle was working on another film while Tamblyn was committed to The Grudge 2 (2006).
- The scene in which Billy puts on a Santa Claus suit upon leaving the mental institute is a reference to the character Billy Chapman in the movie Silent Night, Deadly Night (1984).
- The film was shot in Canada and was shot in 29 days
- Amanda Seyfried auditioned for the lead role of Kelli, but lost to Katie Cassidy.
- In the beginning of the film Ms. Mac asks who is not present for the secret Santa gift exchange. Two of the names mentioned are Chelsea and Greer. Chelsea is the name of Glen Morgan's daughter from his marriage to Cindy Morgan who is also Kristen Cloke's stepdaughter. Greer is the name of Kristen Cloke and Glen Morgan's youngest child.
- All the girls did their own stunts.
- During one scene the famous "leg lamp" from A Christmas Story (1983) can be seen in the background. This may be a reference to Bob Clark, the director of the original Black Christmas. He also directed A Christmas Story in 1983.
- Re-shoots also included scenes specifically shot for the trailer and TV spots which never appear in the film, such as an alternate death where Dana (Lacey Chabert) gets tangled in Christmas lights and sucked into a thresher, Melissa (Michelle Trachtenberg) is seen cocking a shotgun at a peephole in the front door saying "Merry fucking Christmas", and Melissa walking down a hall where Billy can be seen crawling across the ceiling with a hatchet.
- The hospital at the end of the film is the same hospital used on the show "Supernatural" (2005) also starring Katie Cassidy.
- The sanitarium is the film is "Clark Sanitarium," a reference to Bob Clark, director of the original Black Christmas (1974).
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: Melissa's original death was Agnes ripping her eye out and dragging her down the hall by her eye socket as she screams helplessly. Glen Morgan decided to re shoot her death to being chased and having part of her head sliced off by an ice skate. The eye death became the UK Version death, while the ice skate death was the US Version death.
- SPOILER: The original screenplay was much more serious, and Leigh lived in the end. Also, Billy had died in the mental asylum. The original ending ended as Kelli and Leigh killing Agnes, and being rushed to the hospital. Kelli and Leigh have a heart warming talk, and Kelli's cell phone rings and the caller i.d reads Kyle Aurty's Cell.
- SPOILER: The UK ending ended with Leigh being killed, and Kelli electrocuting Agnes. The US ending ended with Kelli killing Billy after killing Agnes.
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