During production, the crew used cel cameras dating as far back as 1938. They also made Ivana Brlić-Mažuranić's title character a mouse, amid a roster of anthropomorphic animals.
During production, the crew utilized cel cameras from the late 20th century. They also made Ivana Brlić-Mažuranić's title character into a mouse, alongside other anthropomorphic animals featured in the film.