Ryan Reynolds modeled the voice of the cat after a Scottish friend he has known for over twenty years.
The screenplay for this film was featured in the 2009 Blacklist; a list of the "most liked" unmade scripts of the year.
When the girls are at karaoke Allison sings Ol' Dirty Bastard's Shimmy Shimmy Ya, specifically the lyrics " I get psycho killer, Norman Bates/ My producer slam, flow is like bam". Jerry's admiration for women/childhood trauma/ spilt personalities and murders are reminiscent of Norman Bates from Psycho.
Gemma Arterton and Ella Smith were also in the movie St Trinian's 2: The Legend of Fritton's Gold (2009).