Carnivorous plant named Adela was not a prop, but real plant (though not, of course, carnivorous). A specialist from a local university was required to take care about the plant during the filming.
Czechoslovakia's official submission to 51st Academy Award's Foreign Language in 1979.
Robert Redford, Jaromír Hanzlík and Jirí Kodet were considered for the part of Nick Carter, eventually played by Michal Docolomanský.
In this film, Nick Carter has a signed photograph from Sherlock Holmes. While many people think of Nick Carter as the "American Sherlock Holmes", Holmes did not debut until 1887; Nick Carter preceded him, debuting in 1886.