This was filmed simultaneously in a German-language version,
Cirque d'amour (1954). The cast of the German version can be seen in uncredited cameo appearances in the English-language version and vice versa.
Was supposed to be shot in 3-D, but that was scrapped just before shooting commenced.
The name Willi is mainly a German male name, and (rarely) used in the Scandinavian countries as a female name. It is the name of an actor in the German version of the movie, and the name of the main character in the English version.