The stunt work at the end of the "railrun" between Bulcsú and Gonzó, when the underground almost hits Gonzó is real, and no special effects were used.
This film was shot for five hours every night when the subway system had shut down.
This was the first Hungarian film at the Cannes Film Festival in twenty years.
The film includes an introduction by the director of the Budapest Metro (where the film was shot), who says that the film is a work of fiction and that employees of the Metro don't behave as shown.
It took Nimród Antal nine months to persuade the travel authorities to let him film at night in the Budapest underground system. The opening disclaimer stating the the film is not a documentary was one of the pre-requisites to obtaining their permission.