In 1997, baseball commissioner Bud Selig universally retired Jackie Robinson's number, 42. The handful of players still wearing the number were allowed to keep it. As of the film's release, only Mariano Rivera of the New York Yankees continued to wear 42 on a daily basis. Rivera retired at the end of the 2013 season. As of 2014 (barring special requests or approval), no major league player will wear #42 again.
Pee Wee Reese's line that someday all Dodger players might be wearing the number 42 was actually said by Dodgers outfielder Gene Hermanski in 1951. Brian Helgeland liked the quote so much, he had Reese say it because he is a central character. Since 2004, every April 15th has been "Jackie Robinson Day" in Major League baseball, and every player wears number 42. Robinson's first day in the Major Leagues was April 15, 1947.
In the movie, the punishment for not agreeing to play on the same team with Jackie Robinson was being "traded to Pittsburgh". Branch Rickey left the Dodgers in 1950, and become general Manager of the Pittsburgh Pirates in 1953. Bobby Bragan, who said he wanted to be traded but then asked not to be, ended up managing the Pirates in 1956.
The movie sanitizes Leo Durocher's speech to the Dodgers on the eve of their planned strike in protest of the signing of Jackie Robinson. His actual quote was "Don't care if the guy is yellow or black, or if he has stripes like a fucking zebra, I'm manager of this team, he plays!"
When calling the catch of a fly ball in the movie, broadcaster Red Barber says "Back, back, back..." In another play-by-play call, he exclaims "Oh, Doctor!" Contrary to popular belief, Barber didn't use either line regularly. Barber said the only time he used those lines in a broadcast was when he called Al Gionfriddo's dramatic, game-saving catch off of Joe DiMaggio in the 1947 World Series. Since recordings of that Barber call became so famous, many people assumed they were trademark calls.
The Birmingham (Alabama) News reported that Birmingham's Rickwood Field, the oldest surviving professional baseball field in the US, "played" three different roles in this movie. It doubled for Franklin D. Roosevelt Stadium in Jersey City, New Jersey, and Forbes Field in Pittsburgh, Pennsylvania, which no longer exist. It also appeared as "itself" in a scene recreating the 1945 season when Jackie Robinson was a member of the Kansas City Monarchs.
The last scene of the movie takes place at Forbes Field in Pittsburgh. The stadium was not used after 1970 when the Pirates moved to Three Rivers Stadium. Within this last scene, as Jackie rounds the bases for his home run a shot of the Cathedral of Learning is shown. The Cathedral of Learning is the famous building for the University of Pittsburgh. Forbes Field was located right next to the university in real life. After Forbes Field was torn down, the university kept home plate at the field in its exact location. The home plate of Forbes Field is encased in the ground at the same location as it was in the movie in William Posvar Hall at the University of Pittsburgh.
While his career with the Montreal Royals is not explored, Jackie Robinson was a hugely popular player with Montreal fans and after leading the team to the league championship it was noted: ..."probably the only day in history, that a black man ran from a white mob that had love, not lynching, on its mind."
While it is true that Jackie Robinson did not get a hit in his first game, he did get on base via a throwing error by Bob Elliott, third baseman for Boston. He would later score when Pete Resier hit a double.