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 trailer for 1957's "Peyton Place" used Bernard Herrmann's music from the soundtrack of "The Man in the Gray Flannel Suit". When Peyton Place was finally released, it had a score by Franz Waxman.
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.
The opening shot of a New Haven Railroad train supposedly shows Tom's train home, leaving New York in the evening. But then the sunlight should be on its left side (as it is in the interior shot following).
Near the end of the movie, when Betsy's at the police station, Tom asks Betsy over the phone if there are any charges against her. The policeman answers, "Just bring the license" before Betsy can ask him if there are any charges.
Judge Bernstein: [referring to a man who is trying to cheat Tom Rath out of his home]
If you're going to be slick, be slick in the city. They're not as smart there.