Nickie walks past the Empire State Building at night after the concert, but when he looks up at the building, it is seen in daylight.
At the end, Nickie is drying Terry's tears with his right hand. In the next shot, he is using his left hand.
When Nickie sees Terry in the theater, she has a fur coat over both shoulders and her left hand on the middle of the seat back in front of her. In the next shot, only her right shoulder is covered and her hand has moved to the corner of the seat.
When Terry Mckay is teaching the little kids to sing, two of the kids go and do a dance, then walk back around and behind the little girl. In the close-up of the cute little blond girl there is no-one behind her, and in the next shot the boy and the girl are there behind her again.
Just after Nickie and Terry both receive their telegrams on the ship's deck, the light source changes position on them between shots.
In both the school and the apartment, Terry has no visible means of getting around. However, just because the viewer does not see "visible means", it does not mean they don't exist.
Nickie makes a painting of Terry and his grandmother who are both wearing the same shawl at the same time.
This is not an error - it's artistic imagination.
On the ship's deck, Nickie suddenly says "What?" Terry replies "What?" Carey says, "What? What?", then laughs. Clearly, they had messed up the lines but then continued. For some reason the director left it in the film rather than re-shooting it. But it's actually not an error, since Terry does the same thing to him later in the film. It's her way of breaking the moment, changing the direction of Nickie's conversation.
Just after Terry and Nickie get their telegrams on deck, a whale can be seen repeatedly breaching in the background loop of the ocean scene.
When Terry is conducting the children, the song they're singing is in 4/4, but she conducts it as if it were in 2/4.
An open-water shot of the Constitution shows the wake from the camera boat.
A camera shadow falls on a man and a plant when Terry comes out of the dress shop.
The street lamp shown near the playground just before Terry is seen in the classroom, is not of a design used in New York City.
When Nicky enters Terry's apartment, he calls her "Debbie".
Terry moved to a new apartment after becoming paraplegic, yet she chose an apartment where she has to descend two steps between the door and the living room.