Mainly in chronological order, the film was shot in 10 days.
The VFX make-ups took approximately 2,5 hours to apply and almost an hour to remove.
Despite having a licence, József Gallai does not consider himself a trained driver. He had been practising driving for months before filming began.
When the crew shot in an abandoned military building, Lídia Szabó heard strange noises and footsteps, although the rest of the cast and crew were waiting for her in front of the building to finish her scene.