The movie was originally intended to be R-rated, but after the success of 2008's Prom Night (2008) remake, Summit Entertainment planned to trim it to a PG-13 rating. However, the studio changed its mind, and decided to keep the movie as a solid R-rated movie.
The film shares a great deal many similarities with the 2006 slasher horror film Black Christmas (2006). Both serve as a late 2000's horror remakes, both cover sorority girls as the targets of a homicidal, cleverly concealed killer. Both feature a spectacle wearing sorority sister target (Rumer Willis' Ellie in this feature and Kathleen Kole's Eve Agnew in Glen Morgan's Black Christmas), both feature a cheating Kyle character (this film's being Matt Lanter's Kyle Tyson and Black Christmas' being Oliver Hudson's character Kyle Autry), a female protagonist devoted to the concept of the sorority sisters being an actual surrogate family to some extent, a female character who is not a sorority sister but a target of the killer scrambling to find the truth behind the disappearance of their actual sister who serves as a sorority sister, one distinctive center target on the body in each execution (this film's being a oral fixation with all the female victims sustaining blunt force to the mouth and Black Christmas' being an ocular fixation with blunt force to the eye region), both also feature a housemother devoted to her sorority girl chargers who meets at a demise by impalement and is spared being dispatched in the same fixated fashion as her charges and both featuring an alcohol boozing sister who meets a demise whilst lying down (in this case Margo Harshman's Chugs who has a wine bottle rammed down her throat and in Black Christmas Crystal Lowe's Lauren Hannon who has both her eyes ripped out whilst lying down in bed asleep.
Leah Pipes originally read for the part of Ellie. After auditioning for Ellie, she auditioned for the part of Jessica. After a second audition for the role of Jessica, as well as a makeover of hair extensions and a wardrobe change, she was given the part.
In August 2009, the British Board of Film Classification originally classified this film as '18', meaning that no one in the UK under 18 years of age would be able to see it. E1 Films (the UK distributor) asked the BBFC to reconsider, and in a rare move, it decided to pass the film uncut at the lower '15' category instead.
All three Sorority sisters who decide not to keep the silver bracelets ( Chugs, Jessica and Claire) that their House Mother gave to them after graduation, end up dying. Cassidy and Ellie, who choose to wear the bracelets, make it through the entire movie without being killed.
Chugs, Claire, and Jessica were all killed by objects being shoved through their mouths. It's been said that the manner of these deaths are symbolic due to 1) the girls breaking their own rule in keeping their friend's accidental death a secret but instead told someone about it and 2) their promiscuous nature.
The sorority sisters who die are killed in a manner relating to their own vices. Chugs is a heavy drinker and gets a bottle of alcohol shoved down her throat. Claire uses sex to cope with her guilt and is killed in the suds created by the hot tub after she pours bubble bath into it. Jessica tends to talk her way out of difficult situations and convinces the girls to hide the murder of Megan, so she gets silenced with a tire iron through her mouth.
Cassidy chooses to keep the braclet gifted to the graduating Theta Pi sisters by their housemother. The braclet later saves her from falling to her death when the floor collapses and it gets stuck on a nail.