The brief scene with the young woman screaming on the bus was shot with a candid camera on a real bus with real passengers. Their reaction to the scream is real.
Not one tripod was used for this movie - everything is shot with hand held camera, unique for the Swedish movie industry at the time of shooting.
Bo Widerberg had seen La filière française (1971) and wanted to make a Swedish equivalent of that film.
Kollberg's baby boy is played by Bo Widerberg's son Johan Widerberg, who later became a professional actor. He utters his first line ever in this movie, the word 'ball'.
Most of the policemen and journalists in the film are played by real policemen and journalists.