One notable fact is that the actors portraying Danny Reagan’s sons, Andrew and Tony Terrano, are brothers in real life. Their genuine sibling bond enhances the authenticity of their on-screen relationship, allowing for a natural portrayal of family dynamics. Interestingly, the show almost moved its filming from New York to Toronto due to financial constraints. Ultimately, the decision to stay in New York was driven by the city’s unique atmosphere and cultural significance, preserving the show’s realism.