At one point - given as 1933 - Braddock reports a dream of dining at the Ritz with Mickey Rooney. Then only 13, Mickey Rooney was in the film business but not a name to recognize in Braddock's slum. He starred in a series of comedy shorts at the time, but going by the name of Mickey McGuire. Only from the late 1930s through the 1940s would Mickey Rooney become a top star and household name.
While the Braddocks were entering the fancy restaurant, the band was playing an ebullient version of Opus One. Opus One wasn't out until 1944.
When Jim Braddock first shows his wife the $175 his manager gave him, in order for him to train and get back in shape, he holds the money between his index finger and his middle finger. In the next shot, he holds it between his thumb and his index finger.
When Mae visits Braddock in the locker room before the Baer fight, his left suspender is in a different position from each angle.
Braddock passes a movie poster for the film S.O.S. Iceberg (1933). The poster is misspelled "Iceburg."
The credits list Benny Goodman's version of "Don't Be That Way" as the song playing in the club when Braddock meets Baer. That version of the song was first performed/recorded several years later, in 1938, at Carnegie Hall.
In a shot of Joe Gould sitting in his car, you can clearly see the leaves of a palm tree reflected in the automobile's window. This scene takes place in the New York/New Jersey area, where there are no palm trees.
At the end of the final fight scene, when Braddock is celebrating with his corner, one of his trainers, the man who Braddock kisses on top of his head, is wearing modern spectacles.
Braddock goes to Central Park in March, 1935 and walks through a Hooverville in search of his friend Mike Wilson. New York's primary Depression Hooverville in 1935 was located on 10th Avenue near the East River (as portrayed in MY MAN GODFREY). There was a small Hooverville in Central Park located in the drained reservoir, not on the grass as portrayed in the film. When adequate fill could be found for it, the homeless were evicted, and the area was transformed into the park's Great Lawn. Landscaping work was completed by April, 1933, so Central Park's Hooverville had been gone a full two years when Braddock visits it in CINDERELLA MAN.
The family enters the apartment after the electric has been turned on again. Jim is the only one with snow covering his hat and jacket. The rest of the family has no snow on their outer clothes.
In the dock yard working scene, a modern-day crane delivers the sacks that Braddock loads.
During the press conference before the Baer fight, one reporter identifies himself as being from the New York Herald. In fact, the paper had been known as the Herald Tribune since 1924, when the Herald and the Tribune merged.
Baer is shown wearing a robe with his name on the back. In reality, the robe that Baer wore to both of his title fits was a prop from the movie The Prizefighter and the Lady (1933). Baer played a character named "Steve Morgan", and that was the name on the back of the robe.
Opening scene is set in late November on East Coast, but despite undoubtedly chilly temperatures, characters sit outside on patio at night without coats; trees and grass are still green.