One of Gregory Peck's movie children was played by Portland Mason, who was the daughter of actor James Mason, and an Italian delivery boy was played by Johnny Crawford a few years before he would achieve fame on the popular TV Western, "The Rifleman".
At one point, Betsy Rath refers to Grandma's house in Connecticut as "Dragonwyck". This is a reference to a historical romance novel by Anya Seton which is set at Dragonwyck, a large estate on the Hudson River.
Fredric March's character Ralph Hopkins is introduced with the exact same visual and plot premise as his character Jordan Lyman would be eight years later in Seven Days in May (1964): pulling down his sleeve after his doctor takes his blood pressure and advises him to take things easy for a while for the sake of his health.
The train station scenes were filmed at the former New Haven Railroad Westport and Saugatuck station. In 2017 it is called simply Westport station and train service is provided by Metro North Railroad.