Filmed at the same time as The Sound of Music (1965), so the production had a hard time finding extras.
With a budget of two million kroner and a total of 1,000 people engaged (of which the main cast and crew of 40 persons came to Austria from Denmark), this Erik Balling production came to be the most expensive and excessive yet seen in the history of Danish film industry.
The train Ove Sprogøe and Lone Hertz ride is the same one that Maria and the Von Trapp kids ride in The Sound of Music (1965).
Male lead Dirch Passer arrived to Austria straight from shooting another movie in Jugoslavia, the Swedish "Dirch og blåjakkerne". He had traveled in open sports car and unfortunately his eyes had become infected and they were red and swollen. Because of this, many close-ups of him had to be shot later in Copenhagen, then copied into footage of Austrian interiors and exteriors.
At the time of shooting the movie, main actress Lone Hertz, at the height of her career in her most productive years, brought to the set her 3-year-old son, Steen Stig Lommer, who later became an actor himself.