Except for the first and last lines, the divorce court schedule for the next day has the same party names listed for each half-hour session as were shown for the current day's sessions. The prop department probably thought nobody would (or could) remember the sign at the beginning of the film well enough to compare to the sign at the end.
When Chet is racing across the street to meet Flo, and during his nightmare sequence, both occurring at Broadway and West 42nd Street in Manhattan, a large crowd can be seen on the corner watching the filming and being held back by policemen - one who is on horseback.
In his narration of his marriage, Mr. Keeefer states they took an apartment in Peter Cooper Village when they first married. That housing development opened in 1947 but the film takes place in 1950 and by that time they were married much longer than 3 years.
During a flashback that couldn't be happening after 1948 (given a seven year marriage as of 1952), a marquee advertising a 1951 film can be seen in the background.
Early in the movie Holliday's character welcomes her mother at her apartment. When she closes the apartment door an stage hand can be seen helping to close the door from the hallway.
At one point, Mickey Shaughnessy's character refers to his address as being "20-11 35th Avenue, Jackson Heights." Actually, that address would be in Long Island City.