For the remaining three episodes of the season, Den Koninghe is portrayed by Hans Veerman, because Hans Karsenbarg was unable to finish shooting due to a hospital stay. Veerman, who has been Karsenbarg's partner for many years, offered to replace him for the rest of the season. Karsenbarg returned full-time in the 7th season and onwards.
Because each episode of the series is structured in basically the same way, the main actors usually get little variety in terms of the scenes they can act. Because his character is suspected of murder in this episode, Victor Reinier was relieved at the opportunity to do something else for a change.