After Angel finds the baseball and pitches against the wall, when Cesar comes out, Angel does not have a glove, but in a far out shot as Angel turns, he is shown with a glove on. Then, in the very next shot, again Angel has no glove.
In the bottom of the 5th inning of the championship game, as Ricardo is hit by a pitch (at 1:38:39), he is wearing #8 (Angel's number). The scene quickly cuts to a longer shot where he is wearing his usual #7.
Alejandro Chabán (as Alejandro Chaban) is listed twice, in the credits on screen, for the same role, "Javier," in credit numbers 54 and 61.
When Enrique Suarez hits his home run, his bat changes color between shots during the at-bat.
Contrary to the claims of the opening STL-Brooklyn archive footage-based game, Sal Maglie never pitched at Sportsman's Park in 1956. The only time he pitched vs. the St. Louis Cardinals in 1956 was August 5 at Ebbets Field in Brooklyn.
At the final game, the American flag shown has 50 stars. In 1957 (when the film takes place), Alaska and Hawaii were not yet states. They were granted statehood in 1959, so the flag shown should have had 48 stars.
When the team's plane is parking on the tarmac at the end of the film, a modern jet engine passenger plane can be seen flying overhead.
During the final game, a Canadian flag is seen. The flag depicted was the red and white maple leaf design, which was not created or adopted as the Canadian flag until 1965. In addition, Canada had no entry in the 1957 Little League World Series.
The song heard when Maria awaits Cesar for dinner the first time was released in the mid 1990s by a Mexican group Los Temerarios.
When the Monterrey Industrials travel from Corpus Christi to Ft. Worth, a map is shown with Interstate 37 running between Corpus Christi and San Antonio. Construction did not start on I-37 until the 1960s while the movie takes place in 1957.
At the press conference, when one of the Mexican players is asked about the difference in height and weight of their opponents, his lips don't match his words as he answers "Si no los vamos a cargar, los vamos a jugar".
When the Monterrey Industrials cross the border and head to McAllen, they continue on foot through the desert. In reality, between Mexico and Texas there's the Rio Grande.
In the first scenes of baseball in McAllen, all the shots that show background have mountains or tall hills. The terrain around McAllen is a river delta and is flat.