The village where Nina and Ferdinand live in is Ronda in the south of Spain. This village is known for having the oldest bullring in the world, built in 1785.
Walt Disney previously produced a short film about Ferdinand the bull that won an Academy Award for Best Animated Short.
Calming goats are a real thing but are usually for horses, not bulls. Anxious horses, particularly racehorses, feel a calming and soothing presence from having goats in the barn or stable.
In the German version, Hans, Klaus and Greta were renamed Franz, Josef and Sissi, alluding to former Austrian Emperor Franz Joseph I and his wife, Empress Elizabeth (nicknamed "Sissi"). They speak with Austrian accents to adapt the joke. This also corrects Nina's "go eat a schnitzel" line, as wienerschnitzels are from Vienna (Wien), Austria, and not Germany.