Location scouts began searching for suitable spots along the route of the annual Nijmeegse 4-daagse during the 1973 event, so the filmmakers could use them during the 4-daagse of 1974. Having the largest group of extras in a Dutch film up to that time caused continuous problems as people would often come up to the actors to ask for autographs in the middle of a take.
British actress Jessica Benton endured a speed course in Dutch at Zusters Regina Coeli monastery in Vught, but still ended up being dubbed.
4 of the 5 leads would again play inmates in the prison bound sitcom Laat maar zitten (1988). John Kraaijkamp Sr. (once more playing a safe cracker), Jon Bluming and Arnie Breeveld had recurring roles, René van Asten only appeared once.
Josine van Dalsum was contracted to play a part, but dropped out a few weeks before filming began because she objected when a nude scene was added to the script.
Pleuni Touw, Leontien Ceulemans and Josine van Dalsum were all approached for the female lead, but all of them refused when the role was significantly reduced. English actress Jessica Benton finally took the part, on the condition that she would receive top billing. When first time director René van Nie did not comply, she tried to postpone the release date until contract was honored, but to no avail.
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