When Cathy and Raymond were at an all black eating establishment (in North Arlington, NJ), he opens the car door for her. You can see an modern day airline jet in the reflection of the window mostly likely heading to Newark International Airport.
The date is established as October, 1957, however, there are
an awful lot of 1958 cars around. More than would have been on the road so early in the '58 model year. Also: the shot of the quaint town square shows a 1958 Chevrolet Bel Air police car - with all the top trim level chrome clearly evident. Public agencies buy the cheap version, which, in this case, should have been a Del Ray.
In January 1958 (when she could reasonably be expected to be reading the latest January or February issue), Cathy reads an August 1957 issue of Cosmopolitan (Polly Bergen cover) that hit stands a half year earlier.
When Cathy and Raymond are talking outside the big gray building, at one stage the wind is blowing fiercely, making Cathy's hair all messed. It then appears to be perfect again, while the sound indicates that the wind is still blowing. Her hair then changes between messed up and perfect a few more times.
When Cathy is shown from behind ascending the stairs into Dr. Bowman's building, she has a hat pin in her hat. When she is shown leaving the building after her husband's appointment, there is no hat pin.
When Cathy meets Raymond the first time outside her house, she is up on the porch and he is down a few steps below in the yard. He tells her his father has died and she reaches down and puts her hand on his shoulder. The scene cuts to a view from inside the house and through the window you can see that Cathy and Raymond are now at eye level with Cathy's arm stretched straight outward to Raymond's shoulder. Cut back to the scene outside and Cathy is back to being above him with her arm reaching downward.
When Cathy pulls up in the opening scenes she tells David that Janice is going straight in to a bath. But in the next scene while Cathy is discussing table settings with her friend El, Janice is seen in the background with her ballet costume on practicing her dance moves.
Coming out of the theater from watching The Three Faces of Eve, Frank enters the movie theater lobby with his overcoat over his arm. He turns as a man climbs the stairs. Frank turns back and he is wearing the overcoat.
The New Haven Railroad terminated in New York City, not onto Washington, D.C. as the conductor announces. The train pulls out of the station in the wrong direction. The green and gold NH logo was replaced in 1954 by a black, red and white logo.