According to Santo Cilauro, the film took five weeks from original inception to final cut. The screenplay was written in two weeks, shot in ten days and taken to rough cut in two weeks.[5][6]
The Castle was filmed mostly in Melbourne, Victoria during July 1996. The external shots of the Kerrigan household were shot at 3 Dagonet St, Strathmore, and airport footage was shot at Essendon Airport and Melbourne Airport. Location shots of Brunswick feature in the film, including Brunswick Town Hall and Rocky Porcino Pharmacy at 720 Sydney Rd (Dennis's office). Melbourne's 200 Queen Street and the Supreme Court of Victoria are featured along with the High Court of Australia in Canberra. Some of the film is set in Bonnie Doon, and a very small portion of it was shot there.
The name Kerrigan was chosen for the family so that tow trucks could be borrowed from an existing Melbourne tow-truck company with that name. The company still operates today.[7]
In January 2011, 3491 Maintongoon Road, Bonnie Doon was listed for sale. The property appeared in the film as the Kerrigan family holiday house.[8] The property's real estate agent reported that many people called and after requesting the vendor's asking price, replied with a quote from the movie: "Tell him he's dreamin'."[9]
