Trivia: Many of the actors in this film were related. Barry Fitzgerald and Arthur Shield were brothers. Charles and James Fitzsimons were Maureen O'Hara's real-life brothers (Fitzsimons was her real surname), and Francis Ford was director John Ford's brother. In the race scene where Maureen O'Hara is in a hay wagon, the four people with her are John Wayne's children. Patrick and Melinda in the wagon with O'Hara, Michael and Toni stand next to the wagon.
Trivia: As was custom with a lot of films at the time, this movie makes some extensive use of rear-projection. Several scenes were shot in a studio but used filmed or still backgrounds to make it appear like they were shot on location. A lot of the scenes that take place while characters are on a horse-drawn carriage use the technique, except the shots behind the characters are moving. The biggest use of rear projection is during the horse race on the beach.