More than 1200 Neapolitan boys were auditioned to cast Marcello and his friends.
The Island of Amatrello does not exist as such : it's a combination of the Island of Ventotene (Lazio) and the village of Monte Marcello (Liguria).
Professor Pizzuti (Roberto Bestazzoni) was named after Italian stuntman Riccardo Pizzuti, a legendary figure in the Italian film business for being a long-time supporting player in the Terence Hill & Bud Spencer films.
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