ट्रिविया

The shirt that the girl in the forest (Bárbara Goenaga) is wearing depicts Erwin Schrödinger's cat.

The shape of the logo on the gate remote control is also visible on the young woman's shirt (in the negative space between the two cats).

Tom Cruise was at one point attached to do an American remake of the film.

Premiered at Fantastic Fest in Austin, Texas in September 2007.