Blooper

In a time of transcontinental jets, when Mrs. Jacoby returns to her Brooklyn apartment, there is a street scene in front with a car passing, but behind the car there is a horse-drawn wagon.

While a horse-drawn wagon may not have been a common sight in the 1960s, they still were being used. Per IMDb Guidelines, this is a case of "Artistic license: Please allow for artistic license on the part of the film makers. Most movies and TV shows are not meant to perfectly reflect reality as you experience it."

The steering wheel of the taxi cab is on the wrong side.

On the ocean liner when Mrs. Jacoby is feeling ill, a passenger walks by in background, casting flat shadow against what is obviously a painted backdrop of a cruise ship deck.