Trivia

Hannah Murray, Michelle Fairley, Richard Madden and Jacob Anderson are all actors in the Game of Thrones (2011) series.

While the film advertises "from the director of The Ring" director Hideo Nakata was, in fact, the director of the original Japanese film Ringu (1998) to which would inspire the American remake The Ring (2002) by American director Gore Verbinski. Nakata however would return to direct the American sequel The Ring Two (2005)

Hideo Nakata's second English-language film after The Ring Two (2005).

Hannah Murray and Daniel Kaluuya both appeared in the TV show Skins (2007).

Hannah Murray's debut.